People have excessive greed, due to which people can easily get deeply involved in gambling, it happens to most gamblers that they initially come to gamble only for entertainment, but later when they get some wins they become excessively greedy, then it is no longer just entertainment but they want to continuously win through it, and through it they keep moving towards disaster. Here self-control, limitations, and discipline must be maintained, without these, gambling can definitely bring huge losses.
Winning is like a pill when taken you will want more and more and you begin to gradually do beyond the usual as you now see that it has become rewarding and so you can get something really nice from it, this is exactly what happens to some gamblers, they then begin to want more that they no longer gamble just for the fun or entertainment alone because they have seen they can get more than just entertainment from gambling so they begin to intensify and increase their stake, habit and they get in to problems sooner because they lacked self control and all their funds will be lost in the end.
That's not a lie, though some gambler will not fall for it or become greedy when they start to win. The thing is if they are actually gambling for entertainment they will not be greedy and want to win more money anytime they win a little money. Although not everyone will gamble and win that will not try the same strategy again. But if you retry and lose, don't chase your loss.