*snip*
I'm inclined to the same view. Why should the forum change anything in order to protect the parties to what's a pretty scummy activity anyway? The only change I'd support is tagging of accounts which have been sold so that new users are aware the person posting isn't the original account holder (old users probably know anyway, by the change in posting style).
How would the forums tag them? Currently, most account sales occur with a new account listing the account for sale. The account is anonymised by only giving ballpark values for activity and posts.
I don't think the forums should ever tag based on a change in posting style, nor a change of IP address region (possible migration).
The trust system allows users to take this into their own hands, and a false negative trust will be a lot less harmful than a false "sold account" tag.