confession, I actually dont have a high opinion about college-age kids who do valet parking :) you're never going to have a system where people aren't doing what you describe, someone's always going to slip them a 20 or whatever. how do you stop that?
Talking here about bartenders with a crowded bar to handle. They tend to be a little more mature and I've never had issues with bigger tippers making it impossible for me to get served.
