OP, there's not a lot that's going to be done, unfortunately. Theymos doesn't really care if people sell accounts, farm accounts, or any of that. If he did, there are many things that could be done, the most obvious of which would be to ban account sales on the forum. So I think your suggestion will fall on deaf ears.
This is a shame because the amount of spam posts flooding the forum is making it unreadable. 9 out of 10 posts are mindless drivel by people who know nothing about anything, usually poorly written or plagiarized, just trying to fill a campaign quota.
I find its not worth chastising shitposters because they seldom go back to threads to read follow-up comments.
Nowadays I turn to less-trafficked sections like this one because they are more informative and entertaining.
Admittedly I did consider selling my account at one time (about 2 years ago) but I couldn't get the price I wanted so I withdrew my offer and kept it -- and now I'm really glad I did.