I don't think there is a noticeable increase in game changing calls. Yes personal fouls, holding, PI are subjective and so there is inherent inconsistency. I like to point out that catches are now rarely controversial, so this is an area the NFL made improvements. Which call changed the game against the Bills yesterday? In my experience, gamblers have lots of "theories" and most don't actually have a clue what they are doing or that they are not skilled enough to win. I do think Sports betting is something that can be beat but you need a lot of resources (see Bills Walters), the average smuck is just giving the vig away over time. Which is fine, its their entertainment dollars to do that with.
I dont get this statement, bookies dont need parity to make money, all they need are betters.