|A judas goat leading lambs to the slaughter (Photo credit: Wikipedia)|
Apparently they never heard of the "Judas Goat".
Judas Goat is a trained goat that goes out, and leads other goats or lamb to a specific destination, often, a slaughter house.
In general, the judas goat's life is spared while the rest of the flock are slaughtered.
That is exactly how a Ponzi or a pyramid scheme works; some people will get paid, the rest gets fleeced, but they don't know it yet. And they may be taught to bring in even *more* people, "share the wealth / opportunity", so to speak.
In other words, in a pyramid scheme, everybody is a judas goat.