You are assuming that the restaurant stays busy 7 days a week which is rarely the case. The places where I worked, I made decent money when it was busy (during the hollidays and cold weather). But during the slow days, it was normal to see 20 dollars after an entire night which is about 6 hour shift. If you average that out, its not as much as you assume. You also forgot that part of the buser/bartender salaries come out of waiting staff's salary, which varies depending on the restaurant. One restaurant where I waited required 15% for the buser, so after a slow night, you are going home with basically nothing.