Oh my goodness! I'm of the belief that Steve Martin epressed in the movie My Blue Heaven, it's not really tipping I believe in, it's over tipping.
If any one, employer or employee, does an exceptional job I'm going to over tip. In Belize last year we had a guide for Cave Tubbing who kept us entertained on the ride to and from and of course during. As we were about to exit the bus I heard another family squabbling over whether to tip him a whole $5 or nothing at all because they had ones (they were the family from hell any way arguing with each other the entire time). I gave the guy a $20 tip and wondered how people could not tip such a great job and I'll never understand it.