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I disagree. Although it's true that many
so-called gamblers consider gambling as a source of ncome, we shouldn't say they are right (or correct as per your words). They are wrong, gambling have never been and will never be a source of income. With such mindset, any loss will be more painful than it would be for any other gambler who is on it just for fun.
Seeking for more rewards and bonuses I'd OK as long as it's seen as a way to spend more time on the casino and play more not as an extra income.
Taking gambling as source of income depends on individual and if you don't see it as a major source of income, so I can tell you that I have many friends that depends on gambling to make a living. It all depends on the place you come from if they don't take gambling as serious as you think. So many friends do not have a job of there own so they see gambling as a big survival slot for them to make a living and pat bills and is working for them.