After the Sale, What Did the Deal Actually Earn?
What a business actually keeps is one subtraction away: revenue minus the cost of keeping every promise the sale made. How much each customer contributes, how much it costs to deliver what they bought, and the fixed drain running underneath it all, those three decide where you land.
MoviePass offers a concrete historical example. In 2017 it sold a pass for $9.95 a month, one movie a day. Later disclosures showed it generally paid theaters full ticket price for every show a member attended, and that serving its subscribers already cost more than the subscriptions brought in. The trap was structural: a member's extra shows added nothing to revenue, only to the bill. Usage frequency was the variable that decided the whole month.
So the first rule when pricing a deal is simple, though people skip it: trace the path by which the customer receives what they paid for, and note every cost that grows along the way. Goods mean stock and shipping. Services mean hours. A film pass means tickets bought on someone's behalf. Find that spend first, and only then can you see how much of the money you collected is actually free to pay for the rest of the business.
Put the mechanism into a monthly account
Here's a movie-pass business run through with teaching numbers. First month: 100 new members, each buying the current month's pass.
| Item | Teaching numbers |
|---|---|
| Monthly fee | 120 yuan per member |
| Average shows per member | 2 per month |
| Cost to deliver one show | 40 yuan |
| Cost to win one new member | 20 yuan |
| Other fixed running costs | 1,000 yuan for the month |
This example calculates pre-tax operating surplus. Labour goes wherever it's actually used, delivery, acquisition, or fixed costs, and each cost is counted once.
Per member: two shows cost 2 × 40 = 80 yuan. Winning the member costs 20. Each new member leaves behind 120 − 2 × 40 − 20 = 20 yuan.
Twenty yuan each, against a fixed drain of 1,000 yuan: at 50 new members the month breaks even. With 100 sign-ups, the pre-tax surplus is 100 × 20 − 1,000 = 1,000 yuan.
Now hold everything constant except usage. Say members average three shows a month instead of two. The per-member line becomes 120 − 3 × 40 − 20, that is, minus 20. One hundred members now gives 100 × (120 − 3 × 40 − 20) − 1,000 = −3,000 yuan. Same fee, same headcount, one extra show per person, and the business went from ahead to underwater. For a usage-based product, watching what people do with the thing matters as much as knowing they'll buy it.
Put acquisition back in the books
Return to two shows a month. Switch channels, and the cost of winning each member climbs from 20 yuan to 35. Contribution per member drops to 5, and 100 members delivers 100 × (120 − 2 × 40 − 35) − 1,000 = −500 yuan.
A channel that looked fine can quietly lose money if the customers it brings cost more to win, or behave differently once they arrive. So when comparing channels, log the whole chain: what it cost, how many members it brought, what they bought, how much they used, and what serving them took.
The hours you personally spend on sales calls and support deserve the same treatment. Price your time consistently and you'll know, before hiring anyone, whether paying someone to do your job still leaves money on the table.
Month two: follow the same people
Now track the original hundred through their second month. Who renewed, how much revenue did they contribute, and what ticket and service costs did they incur? The acquisition cost was already booked in month one; any extra spend on coaxing renewals gets booked in the month it happens.
Following the same cohort month by month shows you how long payback actually takes. Then, if you want to pour more into acquisition, estimate the next cohort from the renewals and usage patterns you have already watched, and add the new hands, equipment, or venue costs into that plan rather than waving at them.
A ledger worth having answers three questions: what each customer leaves behind after their own costs, how many of them you need to cover the fixed drain, and how much cash it takes to win and serve them. Put those answers beside how many people you can realistically reach and how much you can deliver, and you'll know whether to expand something or fix something first.
Further reading
Formulas and definitions live at Contribution per customer and acquisition costs. To work out how many good prospects there are, see Market segments and entry sequence. And if you're still testing whether anyone will actually pay, start with a small round of demand validation.
Before increasing orders, read Why more orders can leave a profitable business short of cash to connect operating surplus with payment dates. The full reading route is From finding customers to earning money.