Didn't read all 14 pages, but make sure you write the tips off as an expense on your taxes. Same time, I tip for good service (not driving me to the hotel). If the guy loads my bags, unloads them, makes decent conversation, or lets me fall asleep, offers to give a lift somewhere for food, etc....They get a tip, if the guy shows up, lets me load my own stuff, shuts it off at the front door, then sticks his hand out, there's not going to be anything put into it.

Other side of the coin, if i've run out of $ bills, I'm not going to pull 20 bux from the ATM and deal w/ a hefty surcharge, the result. I load and unload my own bags before the driver can do it for me, this way i atleast don't feel bad about not giving the guy a buck.