As for myself; I only tip bartenders and only because I cannot escape it. I often get a tab so I can tip less.
I chose to cook a dinner for my gf rather than eat out...and if we decided to go out, I get it "to go" so I don't have to tip, and then rent a movie.
I don't see the purpose of tipping. I do not see what value they bring. I order food, they bring the food, they fill my cup. It is all rather simple. From McDonald's to Ruth's Chris to Flemings. From dollar menu to $50 plates...the process is the same. I find no additional value that a waitress provides that the 16 year old at Burger Kind doesn't. I would much rather see the cost of service included in the price and not compelled to tip based on some expectation of service. I understand many of you have been waiters...what value-added can you provide that cannot be provided by a Coke machine?