Disclaimer: I don't work at Delter.

After nearly 20 years flying airplanes commercially, I tip a buck per trip, none if the driver is rude, reckless, or doesn't help with luggage. I tend to trip extra when they go above and beyond like taking you places they aren't required to take you (food, training, parking, etc).

If you think about it, a large crew hotel in a big city, a van driver probably does two airport runs per hour. 8 people in the van each way. 4 trips. That's $32 per hour just on tips and minimum wage is at least $8 per hour on top of that. He/she is making more than most regional FOs and most FAs anywhere. So my heart doesn't bleed when a crew member doesn't offer a tip. I don't scold, I don't stare, and I don't make up for them. I just let them do them and I do me.

$5 a bag? Must be nice to have disposable income like that. Bet it is great for picking up chicks to share stories of your humanitarianism.