It all about setting expectations. I typically do this based on the price and atmosphere of the restaurant. If I'm paying $50+ for a steak and had to change ou

It all about setting expectations. I typically do this based on the price and atmosphere of the restaurant. If I'm paying $50+ for a steak and had to change out of my graphic T-shirt to walk in, I expect that I'm paying for someone to ensure it's a great experience and they're ready for it (plus a healthy tip, of course.) If I'm paying $13.99 for a burger and a beer, I just need them to bring me my food and refill my drink every once in a while.