Quote from Bigpipn:
In ¤ost restaurants the servers must subsidize the busboys' and the bartenders" tip earnings. The servers pay a percentage of the overall sales to the busser and bartender. In essence if the tip is bad enough the server must pay out of his pocket for the patrons to eat there. Blacks are bad but latinos are the worst. They are high maintenance and believe that 10% is a great tip.