Sounds like you really don't want to have to tip at all but want to avoid having those servers who are about to be stiffed know about it. Pretty darned tacky if you ask me. These people depend on tips to make a living - and they work very hard for it. Do you behave the same way in restaurants? Now, of course, if you feel the service is so poor as to not warrant a tip (which I have never encountered, but it could exist), then by all means have the tip removed, but at least be honest about it.