I don't know, it depends on the person. I've had friendly, professional servers at Shoneys who I felt inclined to be generous towards, and stuck up servers at quality restaurants who have made rude comments about the fact that I ordered a club sandwich. I don't judge based on where I am so much as how I'm treated.
I once left a guy a $20 bill as a tip on a $20 meal because I was messing with him so much and he was a good sport about it.
Edited, Dec 3rd 2012 6:48pm by Belkira