CLV (Customer Lifetime Value)

Customer lifetime value is the total profit — not revenue — a business expects to earn from a single customer across the whole relationship, from first purchase to churn. It reframes a customer from a one-off transaction into a stream, which is why it matters to support: it's the number that turns a rescued account or a well-handled complaint from a line-item cost into protected revenue.

The simplest form multiplies what a customer spends, how often, and for how long, then takes your gross margin. A more honest version discounts future years and weights them by retention rate, since a customer who is 80% likely to renew is worth more than one at 50%. The economics behind the metric are well established: Frederick Reichheld's work at Bain & Company, cited in Harvard Business Review, found that raising retention by 5% lifts profits by 25% to 95%, and that acquiring a new customer costs five to twenty-five times more than keeping one. There is no universal "good" CLV, but the common sanity check (David Skok, For Entrepreneurs) is that lifetime value should exceed acquisition cost by at least 3x.

What it hides: CLV is a forecast dressed as a fact. It's built on averages and the assumption that past retention holds, so it quietly bakes in survivorship bias and collapses a wildly heterogeneous customer base — where a handful of accounts carry most of the value and many are unprofitable — into one tidy number. The famous 25–95% figure is a ceiling, not a floor; the range exists because results depend entirely on margin and on which customers you actually keep. And a company-average CLV tells you nothing about which specific support actions move it, so it's easy to cite the number to justify a program that never touches the customers who drive it.