Guys, Matchbook, is a genuine exchange environment. It doesn't matter that Mansion's limits seem higher, in everybody's best interest is to start using Matchbook and realize that in play betting is the way to go. If Matchbook continue to offer 2-3 baseball games in play virtually every day, they'll get 1000x more action that what Mansion would see from me. Mansion have been around for years, and they never even bothered to offer a true exchange product, they bear a stigma of just another book already, and that's not going away.
All that is not to say I don't like Mansion, in my post history I've always said that Pinny, 5dimes & mansion are all the baseball outs you need, well now however, that we have a an exchange with decent software, low comission and gladly accepting US customers, the only reason GAMBLERS(yeah, scalpers always need their outs....) would not bet there is ignorance.