I've never had a problem with the small-talk thing. I've been in situations where a coworker and I were travelling together, and when I've had enough, I pull out my iPod and say I'm going to cop some sleep. Earphones in, eyes closed, sometimes I actually fall asleep, but mostly I enjoy listening to tunes for a while, and don't have to make conversation.
As for the tipping, I've never worked jobs where tipping was expected or even occassional, but when I was cooking short-order, I was tipped a few times for some particularly good meals. That was surprising, but I didn't argue; I took the money. I'm pretty sure that in general, I'd take the money someone offerred me and not play some game where I pretend to reject it.