You're still going to be frustrated with odds changes no matter when you cut off wagering. Whether it's at 1 minute prior, 5 minutes prior, etc. All it will do is get rid of the appearance of past posting. You'll still have massive odds changes to which you won't be able to react. It's just an artifact of parimutuel systems.
One option that might work:
1. Stop all wagering X minutes prior to post.
2. Allow all "small" bettors, where small is defined as someone who bets less than $Y/month, to cancel their wagers between cutoff time and the race starting.
This allows some relief to the little guy while also making sure money isn't sucked out of the pools.
I've been following gambling twitter pretty closely lately and it's clear the #1 issue for professional bettors is that bookmakers cut customers off the minute the book thinks the customer is sharp. We don't have that problem with parimutuel systems. There are pluses and minuses to each, but if I'm a professional bettor, I'd much rather bet into a PM pool than a sportsbook. Exchanges would be nice, but as others have noted, have their own issues with rate increases for high volume wagers, and aren't suitable for exotics.
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