On the other hand, if they win, they will return the other day to gamble again. Lucky to them if they win again but most of the time, they are not.
Probably those people don't have a proper way of managing their wins. Most of gamblers are loosing because they lack their discipline. Although they have the right mind set before, it gets destroyed when they are attacked by greediness because they feel that the momentum will continuously be favor to them. On the other hand, gamblers who are winning are those who have discipline, lucky, and those who knows when to exit with their wins.
That's not the main reason, we loss most of the time because we love to play games with house edge.
Even in sports betting, usual odds is 1.90 and that is less 10% because you have to pay the juice or commission and if we constantly take
that odds, we will still loss in the long run, it's better if we will try to sell points and take a 100% odds.