Lifetime value tells you what a customer might be worth someday. Payback tells you when you get your cash back. Only one of them pays the supplier.
Lifetime value is the most quoted number in DTC and one of the least useful for running the business week to week. It isn’t wrong. It answers a question you rarely need answered.
It has four problems. The horizon is unknown: “lifetime” for a brand that’s three years old is a forecast about years that haven’t happened. It ignores time: a dollar of contribution in month 30 doesn’t pay for inventory in month 2. It’s an average, and customer bases are lopsided, so the average customer barely exists. And it’s fragile. Nudge the assumed retention rate a few points and lifetime value doubles, which is how a spreadsheet justifies an acquisition cost the bank account can’t.
Payback asks a narrower question: how many months until a new customer’s contribution, first order plus reorders, covers what you paid to acquire them? It uses only numbers you’ve already seen happen, and it maps straight onto cash.
Lifetime value is a forecast. Payback is a receipt.
The strongest position is paying back on the first order. Warby Parker’s 2021 registration statement said it was “profitable on a customer’s first order” Filed. Casper’s 2020 registration statement described what it called “first purchase profitable” e-commerce economics Filed. Both are worth reading together, because they show the same claim can sit inside very different businesses. Chapter 5 is about the second one.
Most brands don’t pay back on the first order, and that’s fine if the reorders are real and fast. What matters is choosing a ceiling, the longest payback you’ll accept, and holding the media budget to it. The right ceiling depends on how much cash you have and how sure you are of the reorder curve. A consumable with a steady replenishment cycle can carry a longer ceiling than a durable whose repeat rate is still a guess.
Picture two brands that each pay $60 to acquire a customer and each earn $150 of contribution per customer over three years. The spreadsheet says they’re identical: 2.5 times return on acquisition cost. Brand A’s customer leaves $40 on the first order and then about $5 a month in reorders; it pays back in the fourth month. Brand B’s customer leaves $10 on the first order and reorders once a year; it pays back in year two. Brand A can double its spend next quarter from its own cash. Brand B has to raise money to grow at all, and if the reorder assumption is wrong, it finds out two years and many cohorts later.
This is one chapter of The Whole Machine, which is free and readable in full on a single page with no form in front of it.