Very dangerous because they believe so much that it is exactly how is going to happen and they get carried away by that win and they start having challenges, of letting it go and the more they go into it the more they don't want to let go, they will always feel like gambling is another easy way to make money nearby. They are supposed to have the basic understanding that gambling is another way to make extra cash, but not to be seen as source of income.
That is how it works the moment the first win enters it because very hard to stop because you will always want to try out your luck, and some people even get addicted in this process so the first win should not be taking as a previlage that they have gotten another way to make money, it is good that you have realized this early so that you don't make the same mistakes.