http://cs.bloodhorse.com/blogs/wgoh/...ank-angst.aspx
Excerpt:
The instantaneous knowledge of probable payouts, ability to wager thousands of different combinations, and the capability to make those bets just a few seconds before the race when odds have settled, provide CRW players unfair advantages over other bettors. Even if that “human” bettor could instantly discover pool value, speech limitations and relatively slow fingertips would prevent punching in thousands of wagers to take full advantage of that insight.
This setup is especially damaging in converting new players into regular players. Even if new players don’t fully understand what is happening when they bet races, they soon recognize there are few instances where the winning payout is better than expected. The chance of finding that type of payout—an overlay—is race wagering’s real attraction, one of its few advantages over casino games. CRW players have helped reduce instances of such overlays, weakening the betting product for everyone else.
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Not saying I agree with everything in the article but I do agree with most of it. It's a year or two old.