For me there is no reason why to go up in weight class, because when you go up in weight class you have to fight bigger guys - then you have to train against bigger guys. The guys are not better, they're heavier, but it means you have more chance to get hurt.
Sometimes I'm under the impression some of the fights happen that they shouldn't happen because a guy's cheating. Also, I think when something like this happen they should have not only a suspension but also monetary wise enforce a penalty. Maybe take the purse of the fighter to the other fighter.