I know it's been awhile since anything has been posted on this thread... Heck, it's been awhile since I posted here. But anyways...
My parents have never had to use the "clean your room or no sports/other activity" thing with me. I'm the kind of person that can't stand clutter (tell that to my project area that I'm cleaning up right now from having a AP Biology and US history project done at the same time. Both projects due yesterday). My bedroom is pretty much immaculate. It needs a little reorganization which I can do in 15 minutes.
My brother and sister on the other hand have had this tactic used against them because they can be rather messy.