If a gambler has no source of income then when he becomes addicted he may do crime whether big or small. Convincing people who has no regular income to gamble is a very bad thing to do and I am sure I will not try to implement it.
And if this is what happens with that person, then his addicting in gambling will relate to crime and he will do many crimes to get that money and finally, he can change into criminals. From addicting gambler into a criminal could make him breaking the law and he can get jail. And we need to take a look of the person when we want to convince him to enjoy the gambling games.