I have one friend who used to play dice in stake.com, he started with a very small fund ($100), out of that money, he managed to have a balance of 24 ETH at some point but unlucky guy lost everything in one day. Once again, with the bonus he got from stake, he managed to cross 30 ETH within less than a month but yesterday, he lost everything once again.
How come he lost everything one day? Do most of the gamblers lose money in such way?
Because of greed? There are people out there that were able to make profit and never return to gambling. But, yeah, the number of those people are actually low.
Most gamblers does lose money in such a way. They play for weeks to build up profit, and boom! They lose everything in just few bets. This is because the house always has an edge and in the long run, it is the casino that will always win.
You make profit, you leave the casino with your profit to never return.