I'd say that sucky features don't lose you customers, they lose you time. My users have never (to my knowledge) quit in disgust over a poorly implemented featur

I'd say that sucky features don't lose you customers, they lose you time. My users have never (to my knowledge) quit in disgust over a poorly implemented feature, but they complain a lot about them and send me support requests if they're confused. This means I'm often re-explaining the same things or dealing with the same problems over and over. You spend your time either supporting or fixing it.