I only tip if I get a ride anywhere not to/from the airport.

I usually don't even let the van drivers touch my bags and it has to be a huge hustle and bustle because they feel better to make me feel bad by grabbing my bags rather than me not tipping.

I pay $40/mo for parking, and my company reimburses me $20 for it so I pay $20 out of pocket for parking to go to work. I've done the math and If I don't tip, I save $24/mo on 4 4-4days. I use the $4 or $5 on out of the way tips, and the money I don't use to tip I get to use to pay for my parking for work.