Legal and illegal sports books are very profitable over the long haul which means the majority of the betting public’s bankroll operates in deficit mode. The sports book advantage is twofold: 1) a 52.38% winning percentage is needed to break even assuming equal wagers with a typical 11:10 payment ratio for straight bets, and 2) the pointspread attempts to equalize betting opinions thereby not affording the betting public a clear choice of favorable odds. The sports book and linesmaker are formidable foes indeed and combined with all the variables and bounces of the ball that affect the outcome of a game, finding consistent pointspread winners is challenging and difficult. However, the good news is that beating the NFL and NBA pointspread is achievable if the pointspread games that pose an advantage are identified.
Never underestimate the vigorish. The vig can slowly and methodically erode your bankroll over the course of a betting season. Handicapping and betting efforts must overcome the vig or house advantage.