Got to keep those eyes on the screen until the end of the game. Blowouts don't bring in the big bucks.
Think of it as a scripted reality show. Sort of like Pro Wrestling has always been.
If you believe that fine, but that is impossible for me to believe, the thing that keeps the games closes is the talent level is really close between teams and how the rules favor the offense and the clock rules at the end of the game.
Nearly every single player in the NFL was a star player in college football, the worst team in the NFL would dominate any college team including championship caliber teams