Stuart,
It is hard to think of a sport where there aren't people who "cheat" or try to take advantage of the rules in every way they can. Sailing is probably one of the sports with the least infractions. And at least sailors don't usually get accused of taking steroids. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

P.S. If you are sailing in small groups, generally a person who is causing problems will be talked to, reprimanded or whatever is necessary to get them to follow the rules properly if they want to continue racing in that group.