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Yes addicted gamblers use to do this they often talk about their earning with people but this is surely not a good habit. We should keep it secret and away from as people can give us harm to disclosing our earning from other people. Gambling is like a way of earning and it's not for other people but for us that's why don't talk here and there about how much you are earning from gaming.
In the vast majority of cases it's a mistake to consider gambling as a way of earning. Even if you are profiting from gambling for 3-4 months in a row it is still too early to think that you are a pro who can live from gambling. Most likely, you were just lucky, and we all know that luck can't be always on your side. Yet people like to brag about their achievements, even if there are none actually. They want to feel like pros and look like pros in the eyes of their friends and acquaintances. But they must realize that there's a heavy price for this habit.