Nope, paramutual wagering is based on two parties wanting to place a wager on a game or sport, based on skill, not chance to win.I thought regular odds were worked out (over time) on essentially the same basis though, driven by offsetting the bets on all sides.
And fargo ratings would give you a very good statistical basis to start from, even if you didn't do any more analysis.
Perhaps they're worried about being cleaned out by players dumping.
The house so to speak holds both parties money, then pays the winnings to the party winning the bet, less a handling fee for being the broker.