Well there is the prediction machine (.com) that i believe does what you are talking about. think they play the game 500000 times before the game, or something like that is their slogan. You can check out their prices, but I've seen it at like 40 bucks a month for nba, i've also seen an "all sports" pass for a week for 80, not sure what that includes. Most important thing is how accurate, if a bettor can make money off your picks, you can charge whatever you want.