Sure, for a customer. But from a technological point of view, performance per dollar doesn't tell us everything. A company could subsidize their compute service

Sure, for a customer. But from a technological point of view, performance per dollar doesn't tell us everything. A company could subsidize their compute service and get astounding perf/dollar with a not particularly impressive chip. I'd like to know perf/watt, for instance, even if it doesn't matter to the customer.