Your point is correct. But unfortunately, not all gamblers strictly adhere to such rules. The fact is that many of them start gambling sober, but when they lose, they lose control of themselves.
After that, such problem gamblers drink alcohol in the hope that they will feel better about the loss. And what's funny is that after that they go to the casino again, and lose even more.
Addiction does not end with one thing therefore it is better you avoid getting addicted then trying to solve your problem after you have already become an addict. Gambling addiction can make you to become a drug addict, smoker or drunker because you will always find things to use in consoling yourself when you have lost from gambling and these things are what you will find yourself doing and causing more harm to yourself. You should not kill yourself that you are going to make profits from gambling. If it is not working for you, do not force it or you will become broke. When you are not in a good mood, you do not have to gamble and when you are sober too, you should not be gambling, drunkers do not think straight but think abnormal because the alcohol has toxic influence on them.