Personally I think Food service professionals are barking up the wrong tree when they complain of "poor tipping" They need to go fight city hall and make the $2.13 an hour minimal wage into something more reasonable.

Each and every one of them gets very self righteous about thier tipping needs. The truth is you are living on the generosity of others
I have never worked foods service for the same reason I am not a pan handler. I don't want to count on shaming people into acting kinder then they need to be.

I'd rather sign a contract and have an above-bord relationship with the people I work for,