I personally did not find it and only once at that time did I find success at gambling by gaining a continuous profit for a week. I was personally surprised that luck continued, but everything disappeared after I could not control my greed in gambling.
This is the main problem in gambling. When you win money you will never quit because of the greed of wining more and more money, and you will continue until you lose all your money again. Thats why gambling is assumed a worst thing in life. Nobody can quit gambling when they win big money. I always say that gambling should be in limits of money and time.
Human mind generally has this thing called greed that hovers around it. Which is why according to Abraham Maslow theory, human want and need is always insatiable and even if they have all the money in the whole world, power becomes the next thing.
Human somehow tend to want more which is one aspect that a lot of people tend to take into gambling that before they could even realize, they are so deep in their addiction. Like you said, when they win, they simply want more, when they lose, they simply want more in terms of winning, and it only takes setting limitations for yourself that would really bring about not getting to get screwed with your mindset in the long run.