That was totally what greediness can bring into any individual who have get attracted that much in earning an easy money just for playing a certain game. Indeed that we must always put ourselves into control...
Why are you calling it greediness and not an addiction?
Call the disease in its right name, this is not greed but an addiction, a vicious cycle, and endless loop - this is what gambling is.
You are blaming the gambler, whilst the gambling industry washes its hands clean off this - completely unfair.