I'd say this gentleman is completely justified in making a thread about this.  Does anyone really know who runs these exchanges, and what their qualifications are for doing so?  You would never get treated like this with an online stock brokerage, believe me.  These exchanges are all shady if you ask me, and mostly because they're so unregulated (thus far).

Hopefully OP gets his money back.  That's not a small sum by any means.