there were people who BORROWED MONEY to invest with him. 

"Making money" thru speculation and usury.
Used to be simple: You would earn a living by doing something useful. Hey, you have a machine that broke down? Here, I can fix it in exchange for something from you...Do you need a chair? I can make you one....You need a haircut and shave? Step into my barber shop.
Nowadays the masters of our universe "make money" by pushing little numbers around on a computer inside a tall building. These people achieve great status and wealth in our society, while the mechanic who can put your car back on the road or the electrician who can keep your house running are seen as losers.
This shit didnt exist before the guys with the little funny hats invented it. Now we all run around living our lives to the beat of their drums.