[Zumzoa]

It becomes unethical when someone who doesn't know about Ponzi schemes are gets involved. If someone has to tick a box saying that they read the wikipedia (for example) page on Ponzi schemes, they assume responsibility for any loss... assuming that they own the resources being staked, and that they are of sound mind.

It's the kind of thing that will attract smug dicks as early investors, though, and you'll get some desperate people at the bottom of the pyramid.