Of course, you and I know why: we can easily stop going to a certain place if it seems unclean, or if the food sucks. Where's the "choice" for public school students? Yuck, I'm starting to remember the sour tuna pitas and other inedible crap that were the best promotion for brown-bagging.
There was a deli across from work where I usually got breakfast and lunch, and one day the new guy was chopping up vegetables for my omelette with an ungloved hand. I wonder if he understood, "That's gross!" He certainly understood my turning around and walking right out, never returning. There are plenty of other places I can go for clean food.