While your point is valid, you need to see the opposing side. Ponzi's are in a way gambling. Can they be profitable? Yes, ran by moral people, which is the only reason they are allowed. However, most all ponzi operators now a days scamming any investors which is a problem. So in my opinion, they need to be banned and disallowed.
A ponzi cant be run by moral people u little kid .... do you tie your shoes alone ?