I tip more times than not. I figure what the heck, at least it's tax deductible.
This is a true story. I noticed for awhile that new flight attendants were not tipping. At one point we were disembarking from the hotel van and as I gave my dollar, the flight attendnt was looking at me uneasy. I asked her about it (perhaps she thought I was a serial rapist, or something). She told me in training that the company had actually told them that the FO's were supposed to tip on her behalf. Needless to say I tripped over the curb and almost fell flat on my face while trying to explain to her the utter nonsense in that. You don't have to tip, that's your perogitive, but don't expect someone to tip on your behalf.
Another flight attendant told me she didn't tip because van drivers made more money than she did. I told her to go become a van driver then, but that was a stupid reason.
How many times has a van driver steered (no pun intended) to a good restaurant, bar, nightclub, etc.?