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I think that has been answered close to a million times already, in this thread alone, real789.
I think users with high trust ratings shouldn't be allowed to sell their accounts - the only purpose the buyer would have (99% of the time) would be for scamming.
What if they've just lost interest in the BTC scene?
I don't think there's any way of stopping sales and the subsequent abuse of trust. Perhaps there could be some type of voluntary and ongoing pgp verification that the account is linked to the person who earned the trust.
I'm sure that would make it quite inconvenient to sell, as well own, those accounts (and raise their price considerably); but, in the end, it still wouldn't stop those accounts from being sold, unfortunately - nor would it really prevent (at least, shorter term) scams from occurring.
Perhaps there is a "technological" solution to this problem, but I think the best solution is finding a way to encourage and educate users (especially newbies) about the need for them to do their own research and taking adequate precautions when parting with their money, instead of relying on a crutch.