That's a very unique way to protect your winnings might do that it looks effective since you have proven how effective this is, this is one of the problems that confront gambler and it always happens to me, how to protect my winning, there is always a devil in me that says keep on you are still in luck in your next roll or bet, that's where things get ugly.
That is human greed. I've also experienced that when I am gambling very often few years ago. When I'm having winning streaks it's very difficult to stop because your mind is tempting you to bet more. If you let your greed consume you, it will also eat your winnings together with your capital.
We have that experience, and I am sure that not just both of you have the same experience. In gambling, we all have a greediness experience, and the difference is we can learn how to control our greediness, so we don't attract to deeper in the gambling games. Once we lose control of greediness, we cannot hold ourselves back to stay away from gambling, and we will go to the deep of gambling.
We need to protect ourselves in gambling so we can hold our emotion, especially greediness, and we can hold ourselves for using more money to bets. If we can do that, then we can play gambling without the worry of losing control.