when i don't found in balance gambling makes people become greedy and forget him (crazy addiction

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Yes a lot of people stay doing it again and again because of the fact that they are thinking they can become rich from it..
Well you can become rich from it but you need luck for than and since 99% of us does not has this they will even lose a lot of money, its as simple as that.
You don't know when you will be lucky so you have to try your luck every time and trying your luck involves money as the is the main requirement to gamble, with that way we can easily lose if we keep chasing for our luck which is not certain when it will come.
That is why this stuff called gambling, nothing certain and predictable here.
And what makes gambling fun is indeed because of trying to make a prediction on something that uncertain .
But mostly once they get into the game , they ae going crazy yeaaa , they will not stop until they feel satiafied. And people will never feel satisfied.