Keeping aside some amount for gambling purpose, contributes to saving a gambler from spending recklessly. It's rare to find an income earner who because of his earnings lived a better life while addicted. The best thing for every gambler is playing responsibly, regardless of their status economically. Neglecting the need of staying responsible as a gambler can only cause more harm to the financial economy of the person. Most often, it ends up making the player broke, even as an income earner. Some get tired of their job, due to anxiety from gambling. We all have a long way to go as gamblers, but the good attitude, will help us a lot.
Having a source of income as a gambler to me really matters a lot and it helps you the gambler to keep going without feeling much pain when you lose, unlike a gambler that doesn't know where the next money will be coming from, but on the other hand you're right because even though you have a source of income and don't gamble responsibly, then you're likely going to get screwed and may suffer economically because you might end up gambling out your entire salary.