No, I tip because it's customary, and part of the service staff's expected compensation. And also, I understand that there are consequences toward acting in a manner that is detrimental to the service staff, due to no fault of their own. I have no problem short-tipping deservedly poor service. And I also DO sufficiently tip decent or better service.

That being said, the well known enforcement mechanism I described above IS out there, and one ought to be cognizant of it.