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.