Anyone that believes this isn't trying very hard. The problem most guys have is they try to beat the sportsbooks at what they are good at and usually what they are best at. If LeBron James offered you a million dollars if you could beat him in either a game of basketball or a game of checkers... which game would you choose? If you want to win at sportsbetting... it's much easier if you figure out what the sportsbooks weaknesses are instead of trying to beat them at what they are best at.
Sportsbooks aren't GREAT at everything... I can assure you of this.