I have started selling accounts after seeing a legendary account get ruined by Lauda only because someone was bumping an Ico thread. I sold him another legendary to help him as I do not agree with negative trust for just bumping a thread or shilling for some Ico, even dt members shill for gunbot in their signatures.
That's the worst excuse for selling accounts I've ever heard. Lauda's negative was probably for being paid to thread-bump, which is much different than using your signature space for advertising. There was a rash of users agreeing to do the former who got caught in a sting operation thing, started by Aventhe (if I'm not mistaken). They were basically agreeing to spam for bitcoin.
I don't tag account buyers and sellers just for the hell of it. Account dealers facilitate scams and promote shitposting--I've said this so many times, and I don't feel like writing out a treatise here on why I feel they're untrustworthy. Every case is different, of course, but most of the people I've tagged are serial sellers, and they're the worst, but anyone who sells an account here is doing a disservice to bitcointalk.