For the prices dropping, it sounds right in theory, but go to world 1 or 2 and you only see people buying at the low end of the price range, and sellers selling at the high end. People don't care how much time they waste(Even though they could have easily earned the money lost from selling a little lower, or buying a little higher in that time) As far as a monopoly on rares goes, how do you know one doesn't already exist?