Alot of it, most of it in fact is the caw's. I do think a little of it is modern technology. I do all my betting on my phone, even when I'm at the track. If I see a horse breaking before the start or half a mile behind the gate, I just cancel my bet before the race starts. Back in the day you were pretty much screwed and could toss your ticket immediately. Or if it looks going to the start that a horse is leaving you can fire a bet in that you normally would not have made. But like my first sentence read the vast majority of it is caw's