Retention: Why It Matters More Than Ever?
Your Existing Customers May Be Your Most Underutilized Asset
Now’s The TIme To Focus On Existing Customers
By Mike Ridgewell
Churn Is a Balance-Sheet Problem: The CFO’s Case for Retention
Every serious C-suite deck already reports churn. It’s there, tracked quarter on quarter, sitting a few rows beneath the revenue number the room actually leans into.
Look closely at the businesses that compound, and the same thing stands out: they don’t treat retention as an operational metric to monitor. They treat it as a core financial asset and invest in it like one.
Costco is the cleanest example. Its membership fees are less than 2% of revenue but contribute more than half of operating profit, so the renewal rate, currently around 92% in the US and Canada, doesn’t sit in a marketing report. It sits at the centre of the financial model, and it’s Costco’s chief financial officer who walks investors through its movements, basis point by basis point, on the earnings call.
Amazon and Walmart are pushing membership models hard for the same reason analysts now treat that “recurring revenue lock-in” as one of the strongest things a business can carry into a downturn.
Retention is a marketing job. Marketing owns it, runs it, lives in it. What sets the best companies apart isn’t who holds the work. It’s that finance values it correctly, funding it as an investment rather than booking it as an expense. They put money behind keeping customers with the same seriousness they put into winning them, because they’ve done the maths on what each is actually worth. Everywhere else, retention is treated as a cost to be controlled, and the first thing trimmed when budgets tighten. That is precisely the wrong instinct for the highest-return investment in the business.
I’ve spent more than thirty years on that marketing side: running direct marketing and loyalty at Disney, building the Disney Movie Rewards programme worldwide, and leading Growth & CRM at Fandango before I started doing this work on a fractional basis. The pattern repeats almost everywhere I go. Companies pour money into the top of the funnel and treat the bottom, holding on to the customers they already paid to win, as something that should simply happen on its own. Same function, wildly different budgets. That’s backwards, and it’s expensive.
The number worth keeping on a card in your wallet
The most-cited statistic in retention research comes from Fred Reichheld at Bain & Company, the same man who later gave us the Net Promoter Score. His finding: a 5% increase in customer retention can lift profits by anywhere from 25% to 95%.
That range gets quoted everywhere. The 95% is the ceiling, not the expectation: what’s possible in the best industries and cohorts. The figure that should actually focus a CFO’s attention is the floor. Even a 25% profit improvement from a modest retention gain is a return most paid acquisition campaigns simply cannot match. And note the word: profit, not revenue. Retention compounds on the bottom line, because a customer you keep costs very little to re-acquire.
Sit that next to the cost side. Acquiring a new customer can cost five to twenty-five times more than keeping an existing one, depending on your sector, and acquisition costs have been climbing hard as channels get more crowded.
Existing customers are also far likelier to buy again: the probability of selling to someone you already serve sits around 60–70%, against 5–20% for a cold prospect. In most businesses, somewhere near two-thirds of revenue could come from customers you’ve already won.
The marginal pound spent keeping a customer almost always outperforms the marginal pound spent chasing a new one. And yet most budgets are weighted the other way.
Why the budget is upside down (and it isn’t an accident)?
If the economics are this clear, why do so many companies still pour the majority of marketing budgets into acquisition? Perhaps it’s legacy inventive thinking. Investors reward new customer counts. Growth targets get written in new logos. A fresh win gets celebrated in the all-hands; a renewal that quietly held the base together rarely gets a mention. The retention metric is reported, but the investment never follows it. It stays a line marketing is asked to improve without being given much to improve it with.
This is where the CFO can be an ally. Finance is the one seat that sees the whole equation: what it costs to win a customer, and what that customer is worth if you keep them around. Put those numbers side by side, and the reclassification is obvious. Retention isn’t an expense to be minimised, it’s an investment to be funded, and usually one of the highest-return investments on the table. The CFO’s job is to move it from one column to the other, and back it accordingly.
Moving retention onto instruments a CFO can defend
The way to win that backing isn’t to wave a marketing metric at the board. It’s to translate retention into the language finance already forecasts in.
A handful of measures do most of the work. LTV:CAC tells you whether the customers you’re buying are worth what you pay for them; three-to-one is the rough benchmark for a healthy business, and retention is the lever that moves the numerator. Payback period tells you how long your capital is at risk before a customer turns profitable. Net revenue retention tells you whether your existing base grows or shrinks on its own, before you spend a penny on acquisition. And cohort retention curves, which track each intake of customers over time, turn churn from a vague worry into a line you can actually manage.
The reason this matters beyond the marketing department is what it does to your forecast. A business that retains well is more predictable, and predictability is what boards and investors quietly pay a premium for. Growth bought entirely through acquisition is rented; it stops the moment you stop spending. Growth underpinned by retention is owned. When you’re sitting in front of a board, an investor, or a buyer running due diligence, the quality of your retention is one of the clearest signals of whether your growth is repeatable, or whether it only holds up as long as the acquisition budget does.
What actually moves the number
None of this is solved with another loyalty card and a heavier email schedule. Real retention work starts with a diagnosis most companies never run: why, specifically, are customers leaving, and at which point in their journey? Cohort analysis usually reveals that the leak isn’t everywhere; it’s concentrated at a moment you can name and fix, often right after the first purchase.
From there it’s the unglamorous work of closing that gap: sharpening onboarding, fixing the part of the experience that quietly disappoints, building a relationship that gives people a reason to stay beyond price. The thing I learned at Disney is that the strongest retention is emotional, not transactional. Points buy a second purchase. A relationship buys the next decade of fandom. The companies that understand that difference spend less to grow and forecast with far more confidence.
Where this fits, and where TL Agency comes in
This is where bringing in senior marketing leadership pays for itself quickly, and not by spending more at the top of the funnel. The fastest return is usually found in the margin already leaking out of the bottom, and you don’t need a full-time chief marketing officer on the payroll to go and find it.
At enterprise scale, the retention conversation rarely stays in one lane. The moment you get serious about keeping customers, you’re into the first-party data you hold on to them, the regulatory obligations that come with it, and the brand promise that makes loyalty possible in the first place. That’s exactly why I work alongside TL Agency & Consultancy: the retention decision, the data and compliance decision, and the brand decision get made in the same room, by people who advise CEOs, CFOs and General Counsel for a living.
If your acquisition costs keep rising while your margins don’t, the answer probably isn’t at the front door. Talk to TL Agency about funding retention as an investment rather than a cost, and finding where the margin in your own numbers is quietly leaking away.
Sources
- Frederick F. Reichheld and Bain & Company, on the link between a 5% increase in customer retention and a 25–95% increase in profit, discussed in the Harvard Business Review (Amy Gallo, “The Value of Keeping the Right Customers,” 2014, hbr.org/2014/10/the-value-of-keeping-the-right-customers) and in Bain & Company’s own research (media.bain.com).
- Harvard Business Review and Bain & Company, on the cost of acquiring a new customer running roughly five to twenty-five times that of retaining an existing one.
- Farris, Bendle, Pfeifer and Reibstein, Marketing Metrics: The Definitive Guide to Measuring Marketing Performance, on the roughly 60–70% probability of selling to an existing customer versus 5–20% for a new prospect.
- Costco Wholesale Corporation, fiscal 2025 and first-quarter fiscal 2026 results, for membership renewal rates (approximately 92% in the US and Canada and 90% worldwide) and the role of membership fees, which are under 2% of revenue but more than half of operating profit.
- Bernstein analyst commentary (via Investopedia), naming Amazon, Walmart and Costco among the businesses best positioned to weather a downturn on the strength of membership “lock-in.”
Mike Ridgewell is a fractional CMO and the founder of Denmark Street Marketing, with more than three decades of client-side marketing leadership at Disney and Fortune 500 brands, including building the Disney Movie Rewards loyalty programme. He partners with TL Agency & Consultancy on marketing leadership engagements.
