Fastkey admin/supporter of that site wrote a thread in scam accusations about the site and them being group of people who are not connected (or say same person) promoting their own shops. I did got a hint of this but there isn't much evidence present so I assumed they all are same.
Even if there are different users, for me anyone selling through that site which is allowing people to sell illegal goods at mass order shouldn't be let go. In my books you kinda are promoting the site.
Good point, it's hard to prove that two groups are different especially when they make matters complicated by accusing each other of being the scam.
Really the best course of action, in this thread in particular, is to tag, and move on.