if I can do it myself, I do - especially the bags; i do not use the skycaps either.. very few exceptions why I would and then when they started mandatory charges, I won't even look at them
I don't tip the hotel/car rental shuttle driver if he/she doesn't touch my bags
some places you just tip.. restaurant where served or cabs and there really isn't anyway around it or bartenders
I never understood why its customary to give a hair cutter a tip. they are paid more than min wage.. for me.. its a 15 minute job tops. In the end they get 2 bucks from me