I dont have any on me.
I am not required per my contract to do it.
My wife is out of work due to Covid and her, plus my three kids are far more important to me.
The van driver is also the manager, front desk clerk, maintenance technician or pretty much any other job at the hotel as is common these days. They are already receiving a higher wage than minimum and running the occasional shuttle to pick us up is secondary.

I could go on and on. For the record, I almost always tip assuming I have singles on me, which I usually do. However, my main beef with this entire thread is the ignorant notion some like to state that watching me fail to tip a van driver is somehow a glimpse into my soul, moral and ethical beliefs and general personality.

Give me a break. If someone chooses to tip, great. If they dont, great. It's a personal choice and I am not so pretentious to believe that I can glean who they are based off one interaction.