People like the repeatability of Domino's, Little Caesars, etc. Most of them just aren't adventurous eaters and see no need to change. I know this because I am related to a bunch of these folks.
I make my own pizza dough, and keep a bunch of dough balls in the fridge or freezer. I wouldn't trade my sourdough crust for any I've had...and it's significantly cheaper than take out.