People are susceptible to cognitive biases and believe what they want to believe. However, they often don't realize how irrational or even misguided their beliefs are. Only dramatic events involving the loss of part or all of their capital can disabuse a person of these illusions, and often it takes several losses. When a person is lucky, they feel like a god; when they lose part of their capital, the belief in the possibility of recovering their losses arises naturally.
And as a gambler, we all have that kind of mindset, otherwise we won't take that big risk. It's like our minds are playing tricks on us, but I guess that's also part of human nature. To follow what we believed is right, but knowing that it is irrational and biased.
Maybe there are few who get back their losses, but then again if you have experienced that, then you will go on the cycle of repeating that same lost-recovery cycle until you can't control it anymore and losing more what you recovered.