The schools pay the same price for this as for a decent meal. Where does the money go?
The lunches, for the majority of the schools, are not prepared by someone’s mom working part time for the school. The food is produced by mega-corps on assembly lines run by MBAs that produce lunches to the technical specifications of the USDA food Nazis and Moo without regard to it being edible or consumed by the kids. Since the board, school staff and teachers don’t eat the crap there is no real incentive for the schools to change.