Gamblers should be able to use gambling as entertainment and not make it a profession because they will only fail and also lose a lot of money. They will be discouraged, depressed, frustrated and various other negative feelings that will make them determined to keep trying until they succeed. Instead of succeeding, they will end up losing more because gambling is not a way to make money. They might be able to win but the win is still far from breaking even so the harder they try, it will only increase the number of losses even greater. We must not be like that gambler, especially if we have started to learn about self-control and limits, which can prevent us from experiencing more losses.
The problem is people should start accepting the fact that gambling is not a job where you earn money from, the moment people start having that idea I think we will not be hearing things like a gamble addict. The reason why people are addicted to gambling is because they make little money from gambling but the money is not enough and the idea of keep on betting you might gain huge profit. Sometimes the fustration and depression make young people to take hard drugs.
But on the other hand and basically it is very difficult to accept that fact buddy, none other than that because they come with a mindset and goals that should not be, usually people who will experience downturns or things that are beyond expectations when they come with the intention of making money, not gambling to find pleasure. Whereas the real fact is as you said that gambling is not a place that can earn, I think they have made the wrong assumption, I'm not saying it really doesn't earn because I admit that there is a chance of winning there but what you are concerned about is that all final results always depend on luck and also they don't and we will never know when we will be lucky.
If they had the idea as you said then obviously I don't think they would have suffered a lot of losses and other problems caused by the impact of gambling such as finances, the more precise reason why they can enter the addiction phase is because they are too much in putting hope in a place that has absolutely no certainty whatsoever about whether you will win or lose. In essence I think they are overreacting and misunderstanding the opportunities that exist in gambling which makes them behave excessively in their gambling involvement.