If you’re legitimately broke and can’t afford the few dollars a trip to tip the van driver then I won’t judge. Hell I’d probably offer to give you the money to tip after I saw you weren’t tipping. But if you’re constantly grabbing a Starbucks between legs and drinking beers on overnights while neglecting the customary $1-$2 van driver tip I’ll automatically think you’re a narcissistic out of touch DB and may make some friendly joking comments about it.