If you WIN you WIN! Any user can independently verify the outcome/result from any sports website. And it cost $1 to play 
Otherwise, cut the crap. So is the prize pool will be determined in the number of those who make a bet or the $10,000 is fix no matter how many bets has been made? I mean if it's depend on the number of bets then we are just fooling ourselves here as will never have the $10,000. More likely, you're just new and your offer is shitty good to be true.