Early revenue has a way of making every customer look equally correct. They signed, they are willing to try, and there are not yet enough of them to see a pattern. But the first ten customers do not simply confirm a market. They quietly choose one.
Each asks for an exception, introduces a workflow, supplies a phrase, and becomes evidence in the next sale. Ten customers with the same urgent problem pull the product toward a system. Ten unrelated logos pull it toward a collection of favours, impressive in a pipeline and incoherent in code.
The useful test is not whether a customer will buy. It is whether serving them makes the company more legible to the next customer. Do they feel the problem at the intensity the thesis assumes? Will they change behaviour rather than merely attend meetings? Does their definition of success repeat?
Sometimes the largest logo is the wrong teacher. Sometimes slower revenue buys a much faster company. Choose the first customers with the care reserved for early hires, because their preferences will remain in the product long after their contracts are gone.