The moderation team saw many people scammed lately after having obtain a rapidshare premium account in a trade.
It looks quite easy for the original account holder to get back his account pretending it was hack.
I suggest you to make sure the people you are trading with on such a trade is well-known and trusted in FST before doing so. Moreover, there is no way our middleman team can prevent that.
So be careful, RapidShare scammers do exist