The thing is a bankroll for most guys is what they have to their names.So losing it basically puts them ina spot that they may never get out of. Go to Vegas sometime and hang out in the books, you will see what I am talking about.
They will never learn discipline, basically because in their minds they cannot afford to.
Peple that lose eveything dwell on it way too much to ever dig themselves out for the most part. Sure you might have 3-4 guys that might be able to do it, but when you consider how many degenerates there are out there that isn't even a blip on the radar.
If they truly had discipline they wouldn't have started gambling in the first place.
Sports Gambling is a horrible past time and people don't get into it for the money, they get into it for the excitement. That is where the oxymorons start. Hard to have discipline when you start out looking for one thing, go dead ass broke, and then try to switch gears starting out over again with far less than what you had the first time.