A few years ago, I lost a lot of money in the dice. I tried to play by Martingale's strategy with a minimum bet and saw good results. But when I increased the initial bet I got 8 times in a row "no". My money was just not enough for the next bet.
After that, I don't gamble very often, but if I do, then before the game, I determine exactly how much I can afford to lose.
That's the correct mindset.
Too many people think they can simply keep doubling up until they eventually get the hand they want. However, they'll soon reach a point where they can't afford to double up again and will be faced with the decision whether to keep going or accept your losses and stop. The bigger man will be able to know when to call it a day, whereas the problem gambler will continue.
Remember guys, gambling should be for fun, not profit. If you think you'll get rich gambling, think again.
There's actually two type of gambler:
1. Those who love to play no matter what the result ... they are happy doing so
2. Those who looking for profit in the long run , I doubt you can do it in casino but possibly sportsbetting have better chance.
The OP story show us how his friend gamble for entertainment and doesn't even care how much he have lost in the past , the most important for him is that time when he won a 300x jackpot , fair enough for those who looking for entertainment in gambling.
But not for those who looking for profit , they would of course calculate everything.