I think gamblers have very weird mindset, they always think they are making the right decision, they are losing a lot of money and they are going for more, always thinking they can win, if they win, again they think they can win more, and they end up losing everything .
Of course you have to be motivate yourself when you are playing gambling so that you will not attract negative things while you are playing gambling, the only wrong with their mindsets is that they are still encouraging themselves to gamble for more even though they are losing because they believe that they are going to win in the next round, but the thing that they are missing out is that gambling is not easy as they thought.
Yes in some point that mindset was good that is what we called being optimistic but what is not right there was they forgot to control theirselves. They didnt notice that because of their greediness to win, they are slowly losing their money. The gamlblers mindset was always to win because thats their goal why they enter that world.