Frustration and depression come mostly when we make gambling as the main way to get money and we play beyond our limits. I experienced such feeling too in the past just before I realized that gambling could lead me into the hard situation if I keep playing and obey my greed.
That is what a poor mindset does. A person having a poor mindset will always think of a way that he or she can do to make easy bucks.
Therefore it will always be a matter of decision making. Tho, by this depression there are also some who can overcome the said situation and will go back more prepaired , much wiser and careful.