Yeah, greediness is the number one killer when we are talking about money, and the first thing that you need when you are into gambling is money, having the right mindset and having the right balance and control with your emotions will always keep you away from any possible greed, if you can continually control yourself from making the right decision in each gambling sessions that you take, it will help you to continue enjoying and limiting the amount of money that you may lose when you exceed from your sets limitations.
At the same time, like any average player, I like to additionally play with bonus money. I love the feeling that the casino allocated funds to me, and I didn't pay anything for it. I don't know how much such promotions make us get involved in the casino, but one thing is clear that the emotions are great: to play for money that is not really yours, because you haven't invested anything. But in such a game I once won $ 350 by betting on the correct number! the bid was, if I'm not mistaken, $10. And it would seem that I should start playing further, motivated by such a win. But in fact, I never visited that casino's website again.
There is nothing wrong with gambling if it is done like a fun and not when the gambler uses all he has to do bet a particular game and which eventually when the outcome does not favour the gambler he will loose everything and plunge into emotional damage.