[ghx]

> We tip barbers and coat checkers along with waiters, but not doctors, flight attendants

You don't tip people who already get paid really well. I guarantee that you would tip your doctor a lot if doctors usually only made $8/hour.

[krzyk]

It doesn't matter how much given person earns, I have no idea I don't see his/hers pay slip. You pay for the service if it is good you can pay more, if it is bad you would like to pay less (if at all).