To me, it is very simple. It's your money, spend it how you seem fit. Tipping is a personal choice, do it if you want to, don't if you don't want to. It is my opinion that those people who feel it is necessary to do so are worried what other people think about them. I don't worry about what other people think about me, as I probably will only see them that one time. I don't go out to restaurants often, so I don't know any server personally, but I feel if someone does a good job serving my needs in the restaurant, I will tip them accordingly.