How much can you afford to pay to acquire a customer? The answer isn't first-purchase value but customer lifetime value (CLV) — a customer's value over the whole relationship. Here's what it is and how to get it into measurement.
What CLV is
Customer lifetime value (CLV, sometimes LTV) is the total value a customer brings over the time they buy from you — not just one order. For repeat purchase and subscriptions this number is crucial; the one-off price of the first purchase undervalues reality.
Why it matters
- It sets the acquisition ceiling. If a customer brings 5,000 over the relationship, you can afford to pay more to acquire them than their first 800 order.
- It changes how you rate channels. A channel bringing loyal customers is worth more than one with one-off purchases of the same size.
- It's the basis for retention. Without CLV you can't see the value of keeping a customer.
How to get it into measurement and ads
- Reliable identification. CLV needs to recognize a returning customer — see new vs. returning customer. Client-side loses this to ITP; server-side keeps it.
- Send a value derived from CLV. Instead of first-purchase price, send advertising the expected customer value — the server-side container is where to add it.
- Join with repeat-purchase data. CLV rests on purchase history, ideally from BigQuery / CRM.
Summary
CLV is a customer's value over the whole relationship — and it's what decides how much you can afford to acquire. To measure it and send it to advertising, you need reliable returning-customer identification, which server-side tracking provides. More in measuring subscriptions and customer value.