I think its more of a greety Eastern thing. EVERYONE has their hand out there. About the only time you might get a tip around here was when UPS took cash for COD's and you didn't have the correct change. (and at Christmas you might get a few bucks or a bottle of booze.
Dont turn down tips. Its rude.
Had a banker guy that would give me 20 bucks EVERY time he saw me. 5 days a week sometimes. After a few months of this, I kinda made a scene and denied the tip, doing like a juke move, and saying "I make enough money, yada yada". He used to be real nice to me, money aside. From then on never says anything, just a head nod. I thought about it some, and he musta been doing that to show off for the teller girls.
Anyways, moral of the story, don't deny the tip.