Hedge funds are trying and failing to hire prediction market sharps. "We are just getting crushed by these sharps," said Susquehanna's Jeff Yass. @iscoe tells the story of a guy who's made 7 figures trading Rotten Tomatoes betting markets, and rejected an offer from SIG: "He said, 'Not only am I just making a killing, but I can do things that a big institutional fund can't do.'" "He's a Rotten Tomatoes trader. He trades how a film's going to do on Rotten Tomatoes. He's made 7 figures,…