No kidding. The mark in any sort of scam is not always a saint. It is his/her greed that drives plays right into the hands of any con artist.
I find it very hard to feel sorry for these people. The first rule of investing is to never invest money that you need for day to day living. The second rule is to always diversify. DUH.
How did all these stupid people get rich anyway? I must be doing something wrong.
Inheritance, or in Zuckerman's case they got so big they had managers handling funds that didn't do their homework.