because they are low odds and you get scamed easily,thats why people are afraid of ponzis
it's high risk. Like everything else that can give you a quick profit..
because people made them to scam others!
I don't agree. Not scam. Everybody knows how the game works. For someone to win, someone has to loose. It's the same if you're trading bitcoins or stocks. If you earn 10 dollars on a trade, someone has to loose 10 dollars.