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.