I have never worked in an industry that required me to receive tips, but I think you are being a little hard on tipping. I always give a tip regardless because I know when I am at work there maybe a day that I am not up to my usual 110 percent, but overall I definitely am. If the service was horrid maybe I would not tip, but that has never been my experience. In my humble opinion, I think you should tip especially if you frequent a resturant...trust me on that fact. You don't want to be eatting unmentionables!!!!
That was just a line from a movie. I always tip well.