Well the greed is the main factor that tempts the people in to gambling. They are bound to lose a lot if they dont stop at a proper time while luck is still on their side. You did lose some cash and I hope you learnt your lesson not to get greedy and gamble with you money again. There are so many other ways of earning money and for me gambling would be nowhere in that list.
First, all people start gambling just for fun, But once they began to earn money in gambling, slowly they will turn to become greedy. Yes if free money is coming without any hard work means all people will get addict this very quickly. And they will become greedy. But if it comes to me I am not saying that I am not greedy, but I am not 100% greedy person, I have control in my play.