Sometimes they don't get hourly pay and only work for tips.
In some restaurants, the busboy/receptionist, waiters/waitresses, bartenders and maybe even the cooks all pool the tip together and split it. Which means that they all get low wages and work for tip.
Usually when I got out and eat, I pay with a credit card and don't put tip on the Tip line. I slip the waiter/waitress cash for tip. I want the money to go to the person that was waiting me, not for everyone to share.