Believe it or not, in my opinion, it was for your own good. You were taking USD offers on "the only" Chiting Shield. If a GM were to browse through this forum, not only would you be banned but if you happened to sell the Chitin Shield to someone else, the person who bought it would get banned and lose his money (since "the only" CS is easy to trace).
If you really want to sell it for items, just shout in game. You wouldn't have to deal with the bullshit of people spamming your thread.