I remember a race at Gulfstream going back a bunch of years, probably 4 or 5, there was a 4-5 shot that looked fantastic on paper, top jock and trainer. The horse broke 5 lengths slow and i don\'t remember if i bet the race or not, but i noticed the horse went off at 6-5 final price. There\'s no way a horse that looks great on paper with no negatives to speak of goes up 2 ticks unless people are seeing the start and getting massive refunds on the cancel.
I think a lot of the odds changes are not necessarily money coming in after the start, but someone may make 2 or 3 large win bets...watch the first 100 yards and if the speed horse looks sharp, they cancel the other 2 bets...thats why the speed horse will go down in price...because there are refunds on the others who are not near the lead.