I have a set amount I set aside for gambling each fall. IF I lose it, I'm done. If I double it, I quit for the season. I quit in week five this season having doubled my original investment.
It's my opinion a lot are better than they think they when it comes to this type of entertainment. It's also my opinion they still live under the Sunday school admonishments centered on "casting lots."
@jlabit is about to double his starting bank...several have reached the 1.5 million mark only to fall back a bit.
Being discipline is the hardest part of gambling. I'd say 99.9% of gamblers aren't disciplined. I'm probably 25% disciplined, 75% not. If I was 90% disciplined and 10% not I'd be somewhat wealthy. I've wasted a lot of money but not quitting while I was way ahead.