One of the best ways to lose your shirt over the long run is bet chasing. Scenario: You thought you had the lock of the century last evening with the first game. You lost that bet on some unbelievable nonsense, maybe a back door cover in a game that was long saucony grid omni walker over for both teams. You got angry, saw the next game of the night coming up and impulsively doubled your bet for game two to cover your losses from game one. Then, since you had no real system in place to keep you in check, that game ends up a loser as well and you are now down big. Everyone has done this, and I am no exception. This is the lack of discipline I am talking about. You will lose some nights, just like your 401k will lose value some days. It comes with the territory. Bet just that one game and if it loses, cut your losses there and tomorrow is a new day.