A pizza employee makes much more than 13 hr. There are sick days, holidays, taxes, fees and lawsuits. For 13/hr employee you're probably looking at 20/hr at least in costs.
There might be some fancy pizza restaraunts where the staff isn't hourly, but I don't know of any. Taxes and fees are pretty minimal on a minimum wage employee, so that leaves lawsuits which I have no idea how to quantize.
