"once in a lifetime" opportunities are like buses........another one comes along every few minutes.
re: scams and cons, most people who get suckered are kept on the hook believing they MUST get in on whatever great deal. That is why I am dismissive of "once in a lifetime" opportunities and most high return opportunities which are presented to me, especially those presented by strangers and brokers.
Looking back upon $3 silver, that probably was a "once in a lifetime" er. I figured that out when silver was at $6.......