not much of a difference, maybe. But by the same logic, I did not pay very much. It is not like I gave them half of my income or something. So I might as well pay. I am not saying that it would be irrational to pay nothing, but to say it is weird that anybody choses to pay at all is too much.

I also like it better without tipping, and granted, it would also work if people just stay away from restaurants with unfriendly waiters.