Why selling merits is against the rule and selling accounts isn't? Both are giving the unfair opportunity to rank up if the person has a money.
I see a guy selling accounts from Member to Sr.Member on Russian board, advertising this business on his sig.

Yeah, DTs painted him red, but I guess he simply doesn't care, it won't hurt his trade anyhow. But if admins would ban people like him and all of his alts, then we'll see some changes here.