I proceed on the assumption that this is a subtly-written piece of satire.
I have limited knowledge on this but from what I do know—this will be expensive!
As a kid I worked at a pizza joint and food costs on the salad bar always ate out lunch. heh
Produce prices always fluctuated the most, waste was often fairly big as some of the vegetables would get slimy or discolor pretty quick.
Rotating the crocks of salad dressing was important because you can really make someone sick if not tended to properly.
Salad bars aren’t cheap and can easily make people sick if someone tries to cut corners on their work.