Usually, people who win in gambling but not able to cash out or save their winnings and I think this has something to do with a Healthy mindset.
If you do not have the intention to save the wealth, you will lose all your winnings by risking them again in another gambling bet.
There's this delusional mindset or a believe set from gamblers that they could have more chances of winning bigger amount again after getting a win of some attractive figures. By that, they increase their bets and their risk only to end up losing all they have won back to the casino house. Gamblers do this forgetting that a gambler doesn't get lucky twice immediately after a big win.
Indeed mindset plays a role but it's has much to do with insatiable greed than the latter. Only that person that's satisfied with whatever good amount he has won from gambling can redirect the money in investing into others areas that would yield profits. So I think a good mindset goes along with satisfaction.
The major thing with gambling is that it is very hard to see a gambler content with his or her winnings as the taste to win more always surface and it's also quite natural as this is all human greed. I know satisfaction while will help out but its hard to see a gambler satisfied with his winning except he has control and he is not greedy then maybe he can divert his winning into an investment. But even if he does that he will certainly play again and there is a big possibility that he might lose one way or another and if that happens the money which he previously won has balanced with the one he recently lost because the losses are certainly going to be more than his winning.