You can make this argument for literally every business, though. Which business does not have a single pool of resources and multiple clients to consume them?

The majority of factories. They get an order in and produce the product until that order is fulfilled. They don't have to be running 24/7, it is just that that is the most profitable.

But if you stick to your "analogy", a factory also chooses who their customers are. And if some are too demanding, they just drop them. Like the casinos.