Just a guess, but most likely they were short of help, more than pizzas, and thus gave up on making them available to the public. I currently make pizza in a gas station convenience store, I can set a slicer out and its gone in 3 minutes, especially during 5 pm. when people are filling their gas tanks up as well as their stomachs.

It takes a lot of ubiquity to manage both pizza prep and gas when the pumps outside are filling up, and with gas at close to $2.00 a gallon there is also the steady fast concern of drive offs. And Personally, if I own a Mini mart, I'd rather lose a few slices of pizza sales that I few tanks of gas.

Dewey