general thoughts.

I am still tipping the same now as I was in 1981. One dollar.
So I either over tipped then or am undertipping now.

My second airline paid the Captain an extra 4 dollars per RON that was specifically negotiated for the van tips...$2.00 per/ride. There were 4 or 5 crewmembers, depending on which aircraft. Some of us added a buck on top of it.

Not tipping if the van is late isn't exactly fair, as it often is completely out of the drivers control.
Personal opinion: unless the driver does or acts in an exceptionally negative way, I still always tip because most depend on those few bucks above their minimum wage to just get by....

I agree that all employers SHOULD pay their employees a living wage so that we wouldn't feel compelled to tip. However, most employers don't.
The few dollars per month I spend on driver tips has a minimal impact on me. It will not prevent me from paying my bills or being able to retire. If we all stopped tipping those who have come to expect it, it definitely would (does) have an impact on their being able to pay their bills. As for retirement, they probably only can if they win the lottery.

Having enough "ones" on my person is part of my prep for a trip. Plus I keep an extra 20 or 30 in my roller bag.
I have added a $2.00 per night tip for the maids. They probably make minimum wage, often work split shifts, and are often disrespected by those who they clean the rooms for. A clean room is just as important to me as a safe van ride. ( I added this as there have been a few comments about tipping maids as well)

For what it's worth. Just my personal views on tipping hotel staff.