I am not opposed to tipping but I see a problem in tipping when,
1. I carry a small wheeled luggage and don't need anyone to carry my baggage (I feel uncomfortable when Hotel bellboy comes running and open my cab/car door and grabs my bag from the trunk and make me obliged).
2. I feel like being ripped off when a simple drink costs $9-12 and the bar tender expects to be tipped. I think it is tacky to keep a glass jar with a couple of bills on the counter.
3. Last week in a famous Hotel, I encountered 7 attendants (doorman, bellboy, valet, ...) at the front door. I consider this over employment.
4. Most often employers hire people and expect them to support themselves by "tip" money. I have seen restaurant/hotel workers doing a poor job but expect a great tip. In my recent Hawaii trip, the Hotel swimming pool attendant expected a tip when there were no towels and the zacuzzi was not running.
5. I like it whe rich gusts mistake me for a Hotel employee and try to tip me when I give them the most common courtesy or help them! I could definitely supplement my professorial salary!