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Accounts will always be sold here whether we ban them or not, but the best we can do is look at ways at curbing the behaviour and I think letting users purchase more donator ranks like Silver and Gold with the benefits of higher ranks is the way to go. It would pretty much kill account sales because most people aren't going to take the risk of being scammed and all they want the accounts for in the first place is for a larger signature anyway.
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It could also help the spam situation as well, because if the account farmers won't farm and sell more and more accounts, there will be no need to gather activity (and merit) for the farmed accounts, this means less spam or copypaste posts on every board (but mainly on the mostly infected boards...)