Gotcha.
Something else to think about that I didn't write above is that for a lot of mid- to low-end places (and virtually every chain or chain-ish place), employees are eminently replaceable. Being the rock-star server at, say, a Longhorn's Steakhouse does get you a lot of in-restaurant perks (better stations, pick of the schedule, getting away with small stuff, etc.). But when it comes to guaranteeing a base wage much above federal/state law? If you're really tight with management and they're truly loathe for you to leave ... you
might be able to ask for and receive another buck an hour. Push that too far, though, and they're happy to stand their ground and let you know you're free to find work elsewhere. Most restaurants are happy to run through several trainees and see which one or two can replace their previous rock star.
TL
R -- tipped employees at most places just don't have that kind of leverage.