People shouldn't have to tip anything, it shouldn't be the customers job to pay the employees wage. I'm sure some people are going to say... well you should tip because it gives them an incentive to work hard and you should pay according to how well they serve you. f*** that garbage the employer should fire them if they're not working 100% every day, IT'S THEIR JOB.
I don't understand why people have this mentality when it comes to restaurant service staff, pretty much no one else gets tips and everyone seems to be fine with that.