The problem with tipping is that it can be a slippery slope, from something nice but totally unnecessary to something that is considered an entitlement. I live and travel in places where tipping is not expected or considered rude or perturbing of the peace. In Japan, when I didn't have exact change for the street car fare, I waved to the conductor to keep the change. But no, he stopped the street car, got out of his seat and gave me my exact change in coins which was a pittance, really. I like it that way.