I idly wonder what percentage of total sports betting is by "whales", like wondering how much casino money is in the "back rooms" vs. the huge open floor. One sits at a blackjack table with a $10 minimum and 7 people, the casino is raking $70 per winning hand, which is roughly a bit over half the hands, and losing a bit under half. So, if the table is full, they are gaining something like $2 per round per couple of minutes, say $60 per hour, roughly. They probably pay out $30 an hour in labor and then other costs. Maybe they have 20 tables going, so mayb $600 net per hour? Very rough guess.
In a back room with say two tables, the wagers might well be tens of thousansds, so perhaps they pay out much larger sums, with not much additional overhead (comps would be greater).
So, maybe 80% of bets on sports is from "big money"?????
The lines always fascinated me, the kind of ranking I'd do is one using prospective lines from LV.