It’s the holy grail of sports wagering, and yes, office pool entry fees are considered bets. What is it? The perfect NCAA Tournament bracket, of course.Should anyone accomplish the highly improbable, though not impossible, feat on BetMGM’s free-to-play game this year, the sportsbook operator will reward that contestant with a cool $10 million.While the tournament pick ‘em game is free to play, BetMGM is leveraging the arrival of March Madness — one of the most wagered-on domestic sporting events — to lure new customers and drive more business from existing clients.