These Ponzi work by targeting greedy people. There are everywhere and in different form and approaches. There is no free lunch in this world.
Yeah I always wonder why people invest in these schemes with such high unrealistic ROI it makes no sense.
A lot of people see a bunch of other people making large profits and they hunt the same goal. The thing is, for them to make these large profits, there must be someone else funding that, and if they are the last people coming into the Ponzi, they will be the ones losing their money.
These Ponzi's are aggressively marketed and key people are targeted in the beginning. If your doctor or your dentist or someone in power tells you about a huge investment with large profits, you will follow their lead, because you would never second guess their advice. I have seen very influential people falling for this before and I have been targeted with this too, so I know how they work.