If you can control yourself, then you can control anything. But what you said is completely wrong because if you win $1 million, you will lose $2 million. We must change our mindset because if we can control gambling and if we can control it properly, we will never lose more than what we win. Here you have instructed to read a lot of books to control gambling properly. You will never be able to control gambling properly by reading a lot of books. You have to strengthen your conscience and your emotions. Then if you can make it available on your own, then you will be able to make good decisions. But I will say that you have to know when to stop. I will also say that you have to use the least amount of money for gambling and gambling should be used only for entertainment, only then can you manage yourself properly.
All these are just theory, when it comes to practical and real life situations you’ll realize that what the op is saying isn’t too far from the truth.
If you sit down to do a proper calculation of what you have currently lost to the gambling market you’ll see that even control won’t be able to save you from it. Winning 1 million and losing 2 million doesn’t necessarily mean that it will happen after you have won the money, it could be before. Even if we limit it to after, it is still possible to lose it and it happens gradually making you think that the money you’re losing isn’t significant.