because gambling can make a lot of money in a short time and with little capital, so many people who want to get rich instantly from gambling
From my experience the problem is - that people with that mindset who are trying to earn money using shortcuts are almost never successful.
Why? Because even if they won, and earn a lot money they don't know when to stop and walk away from the gambling table.
In gambling the winner is not the one who won it all, but the one who know when to stop and go home.