Making a source of income from gambling usually doesn't end well if you don't have other sources of it or you are not a shiller / influencer of sorts.
I don’t really encourage people to even try and make gambling their source of income, because most of those people do end up being addicted to gambling. I will say most addicted gamblers get addicted just because they have the mindset of making money from gambling. Most of them won’t stop gambling even when they are supposed to stop, whenever they are winning, they will want to increase the amount that they have won, and when they are losing, they will want to win back their losses, which will lead to more losses, and most of them are being motivated by their fellow addicted gamblers not to give up.
Yes, you are right, addicted gamblers usually gets their inspiration from the mindset of becoming a professional gambler or earning a living from gambling. I know that there are some people that luckily made an abrupt huge amount of money and it changed their life for the better, but it's not every body that can have such kind of luck. A gambler should aspire to be a responsible one that doesn't become addicted on the process of chasing after becoming a professional.