I've never tipped - but I do try to by "specials" from him if it's something I need (or want.. ). I get the impression they either get more money (kinda like a spiff) or "extra credit" when they sell the specials. I'll usually get it if it isn't something we HATE .. It's come in handy too - mostly when I've gotten a "frozen meal" (I usually don't get those).. They come in handy as a back up meal when I'm in a hurry ..