When I was in school we did not wrestle in a league, mostly because there were only a handful of schools with wrestling in our league at that time. But I do know that when we would wrestle the schools that were in our league from Football, basketball, etc.... it got the competitive juices running a bit. I agree that leagues for wrestling are somewhat useless, but on the other hand I also think it keeps that rivalry juices in the schools going, and even sometimes gets more fans to come out and watch a duel if it is against a league foe.