I agree and I think it is also a good thing because if that gambler has positive mind setting, then he/she will be less stress in his/her gambling sessions. Although it will really not affect the outcome of the game when it is based on pure luck; but I think coupled with good skills, it would affect in games that requires not just luck but skill as well like poker and sportsbetting.
Definitely we have strong thinking or feeling about our game, and mostly our positive mind setting helpful for our winning and we are able to achieve our goal. But problem is when we achieved our winning in gambling then once again we start to do bet, and in this wise, our greedy thinking or feeling overcome on our positive thinking. In the end, we have lost, so when we have achieved our goal behalf of our positive or strong thinking, then better to leave the game and don't go with our greedy thinking.