I feel they don't need to include physical games.. I'm not able to figure out the main reason for now, but the quickest one in my mind is that those games can turn out to be rigged for a contest of say -- $100k

I’ve seen a few contests where you need to reach a certain wager amount to qualify, and sometimes the player with the highest total wagers wins by the end of a set date and time. But it’s almost always on slots or other casino games with a house edge, not on sports. Any reason why that’s the case?
[/quote] It's simple.. casino games takes only few seconds to click the tabs and produce the synthetic results that determines who the winners will be. Sports games need to run for at least 90 minutes in football, 2 hrs in basketball and the rest to determine who the winner is. How much of those can you bet with in the space of 8 hours to the stoppage time for an entry? Way less than what a casino gambler will submit.