I tend to tip at one Hilton location because they do bring us beverages (except for juices) and also bring up to go cups so we can have a refill to drink while out on the road. But yeah some of the tipping has gotten out of hand. It seems too much of a norm to place a tip spot on the check even in places where there is zero table service. I think they hope to guilt you into giving them more money. Sit down restaurants and bars are a different story.