How Pizzerias Really Make Money

My college roommate stumbled into running a couple of pizza places a bit over 20 years ago. He went with flat-rate pricing, because, honestly, pizzas are really cheap to make.

$9.99, any toppings (within reason). I think they were 16 inches (only one size as well). I'd go up to visit from time to time, and he'd tell me to make myself a fucking pizza. The dough was proofed and the toppings at hand. Not sure what the health department would think about that, but they were very good pizzas.