Originally Posted by
kipper
In the US at least, it's that those who are servers know they receive tips as incentives, while those who aren't servers know they won't.
In PA and in many other states, those who earn tips, in addition to a wage, can be paid a lower minimum wage, as it is assumed that the tips will make up for the difference. Servers earn $2.83/hour, minimum wage, figuring that tips will make up the difference.
I was under the strong impression that if the tips didn't make the salary up to minimum wage, the restaurant had to make it up - that is, no one works for less than minimum wage.