I know that waiters in the US rely on tips, but I think it's unprofessional to deliver bad service just because they think that they won't get a good tip. Whic

I know that waiters in the US rely on tips, but I think it's unprofessional to deliver bad service just because they think that they won't get a good tip. Which is strange considering that people tip for good/professional service. Maybe there is a self-fulfilling prophecy somewhere in there :)