This is really a very good approach of gambling if all the addicted gamblers can adopt it, it will help them reduce addiction and even if any other gambler both new and old adopt such method, they won't face the risk of addiction. Anytime I go gambling, I always allocate the money I can afford to lose, after which, I don't make any other deposit.
It seems simple when you are not playing, but when you get excited and when you have lost everything that was on the deposit, then you begin to perceive everything differently and want to get back what was. It would be reasonable to stop so that the emotions calm down, but if the desire to win back is stronger than common sense, then the deposit is replenished again, or maybe if there is money on the deposit, and you were going to stop earlier, but instead you continue to play further. Even if you need to stop, it is not always easy to do.
With my experience in the past, I know better now, i don't allow emotions to control me in gambling. If I allocate a certain amount for gambling, I don't deposit all that money at once, I divide that amount into two or three places and deposit just one portion and if I lose it just within a short period, I will take a break till next day or hours later. With that method, I have really learned how to control my emotions. I can spend all the first deposit, it doesn't matter but I won't make any deposit again till the next day or later on.