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?
Sports games are easiest among some of the gambling games for participants to win therefore the casino aren't going to give you an easy game for you to win. Games like slots games are based on probability which is luck and in those type of games, you can't use any strategy to have an advantage and that's what the casinos wants. They want to give you the rewards but at the same time, they don't want it to be easy for you to win because imagine everybody that got the rewards won, it means the casino will owe alot of users and this might make them to go bankrupt. Some people don't even consider sport betting as gambling because the results aren't based on luck but skills and experience.