Any other job - the worker gets paid either by the hour, or a salary.
Kind of over-simplified, Trooper. I can give you a long list of other jobs that depend on tips rather than a base salary.
One thing everybody seems of be overlooking: Whether front of house, back of house, server, chef, or dishwasher, you signed on for the wages. Nobody promised you any more than what you are receiving. If you feel you're worth more than you're being paid, move on, and find a job that pays what you think you're worth.
What's that? Still there? Maybe that's all you're worth after all?