Most service people do not tip they must feel they do not make enough money to give it away.

Most rich people do not feel the need to tip, they are not there to impress anyone, and they worked to get where they are at.

Most poor people over tip they are tying to impress, or look down on someone, thinking they are better or the other worker is inferior.

If I don't get the service you do not get the tip, it is that simple

The bus at the Chicago Seminar host hotel is adding $5.00 this year, must be a lot of non tippers on FT, I noticed last year he was playing taxi and very few was leaving him a dime.