Honestly I don't know like most of the other gamblers,because we may win many times but still wanted to gamble so any amount can't make us to stop from betting but if someone really new to betting but they won in few millions then they might quit gambling for a reason.
May be the need of the people varies and some has some loan or debt to repay or require some extra money for something and some just gamble to pull out hat extra money from gambling, may be that would be one of the reason and that amount could stop them once they achieve it. But more likely greedy behaviour of a person would not prevent them to continue gambling.
Gambling is definitely not something which can help you to repay a loan. If someone is stupid to the extent that he/she starts gambling with that goal, I can guarantee that they would not stop until they lose everything, even if they initially won what they needed.
Most of people's brain stop functioning when they are in a pinch situation, and the first choice they will think is to earn money as soon as possible because the due date of paying that loan or debt is approaching, and this is what you called cramming, people don't feel responsible unless they are facing something hard, and that is paying their debts therefore they went to gambling having a mindset that they could do it for the sake of themselves.
But the result are mostly depressing and turns out the other way which they are not expecting, so instead they will only look for a small amount of money and add it to their cash on hand to pay their debt, they will be in a bigger trouble because they need to look for bigger money to pay their debt.