What is such a mystery? People are greedy and there will always be greed in the world. There will always be people who have $1000 but want multiples more. There will always be people who have $10,000+ with the same greedy mindset. They don't want to work hard or invest to achieve that goal, instead, they just want to get it quickly by chance.

It's not a mystery, casinos exploit human nature and unfortunately, greed is a big part of human nature. Especially in those with less life experience or education.