Those season win numbers always slanted slightly upward because the public loves to bet the over. If you add up the projected wins nationwide, both in college and the NFL, it will always be higher than possible. More wins than losses. That's due to the public bias toward the over. Consequently the sportsbooks book two vastly different types of bettors in that pool. They get a steady stream of small public wagers on overs, and limit bets from professional bettors on the under. The professional bettors take the under at least 66-75% of the time.