I'm big on tipping when one is expected to tip. But I can relate to this. Just about the only reason for me to carry cash anymore is to tip van drivers.

Related:
Me and my wife recently went to an Aldi's for the first time. They wanted a quarter to use the shopping cart. As in an actual quarter, for those who are unfamiliar, to put in the cart to release it to be used. I was dumbfounded. I told my wife, "let's look around but I already know I'm not going to be a regular here". Her reply was "oh come on, we can afford the quarter". And I said, "that's not the point, I don't carry change!" We found out later you get the quarter back when you're done. Still doesn't solve the issue of not having the quarter on me to begin with.

I can just shop somewhere else. No big deal. But I can't avoid using the hotel van service (unless I want to spend WAY more money) so I carry some singles when I go on a trip. I probably would tip a premium to someone that made it so I didn't have to carry the singles though.