The problem with trying to fix a race as you describe is that you basically have to have every jockey in the race involved to make sure you get the right finishing order. Once you split the trifecta among 10 jockeys the payout isn't that good. All it takes is for one jockey to actually have a few morals and the whole system fails and the rest of the jockeys are probably out of racing for life. More likely it was just a bad ride, or bad luck, or the horse wouldn't do what he was told.

Just my opinion but anyone who backs odds-on runners and is surprised when they don't win is just getting a healthy dose of reality. Very few horses have more than a 50% chance of winning so why waste your money?

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"Computers can do that????" - Homer Simpson