Sure, flour and yeast are cheap. But then you're spending a lot more than 1 minute of labor per pizza. Maybe you could build a robot that makes it for you, but now you are spending a fortune on capital equipment.

Real-world cost optimizers like Costco have some robots (the pizza saucing machine is cool) and they still end up with a cost around $10 per pizza.

Making pizza has high margins when you charge $25 or more per pizza. Not $10. Pizza Hut charges less than $25 but that includes delivery. From a random web link (https://www.vettedbiz.com/pizza-hut-franchise/) franchises average around 15% margins, which is not great.