I think if a sponsor continually fails to impress you (or even turns ya off!) you definitely may want to give em a pass and look towards others to take their place.

I mean, sometimes you can try and look past it if they've performed well for you and you think it might just be an "off week" for them or something, and you want to keep consistent in promoting them and keeping your surfers aware of em. But if you're totally turned off by them, get rid of em! I think if you're enthusiastic about your sponsors that'll show to your surfers and help get ya sales.