I think I have read about a similar case where an user got so many replies on his thread from accounts that were created the day they made all their comments and after that they all left the forum without logging into their account again and when the user was called out he claimed that they (the accounts) were owned by some of those that patronized him and after their deal he made them create an account here in Bitcointalk to give him a review.

But I’m this case I don’t think that’s what is happening here, it is obvious that those accounts are being controlled by the same user and since the main aim of this act of socket-puppet is to deceive people into believing that he has actually done anything with those accounts and therefore going into trade with him I think that calls for a neutral tag warning others against the risk of dealing with him.