The game is only fun if the wagering and outcomes follow a normal distribution. If "one guy" starts turning a profit, its only a matter of time before his metho

The game is only fun if the wagering and outcomes follow a normal distribution. If "one guy" starts turning a profit, its only a matter of time before his method is discovered and replicated. Over time, this decreases the payouts for all the other bettors, removing the enjoyment of sometimes winning. Reason #2 is if they see someone consistently making money, they have to assume that person is rigging the race somehow, even if they can't prove it. Sure they want you to play, win, and have fun. But they dont want you to do it as a career. That exposes them to liability: say a jockey/owner/trainer sues the track after rigged races were discovered. They could point to a professional gambler and say "you should have known that this guy was involved because he turned an enormous profit over time. You turned a blind eye to fraud, profited from it, at our expense. we want damages". Third reason is they dont want people selling their "systems", which only leads to problems and fraud. Someone who won a lot (or appeared to always win) could show others at the track and say "I'll let you in on this system too, for a price". Fourth reason would be anti-money-laundering. Even if you (somehow) found some rinky-dink "system" that made a nominal amount of money, higher-level criminals would absolutely jump on it to launder drug proceeds.