It somehow reminded me of stories about some gamblers who resorted to borrowing money from their relatives and friends to continue gambling with the hope of winning back the money they lost in the casinos. I guess it is better for gamblers to learn how to stop gambling and cut losses early if they found themselves starting to borrow money to gamble as the chances for them to recoup their losses are very low.
Forcing ourselves when we lose is definitely not something that is very good to do, and as you said in such a case one must realize that returning to financial condition after getting a loss again and again should not be something easy and tends to be impossible so in this case the importance of trying to stop when we get a loss is very good. That can be one of the good things and make us at least not too focused on the gambling losses that have occurred.
We must realize that although ambition is good but being too ambitious especially in gambling will only destroy yourself.