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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
As others have stated, it will be very difficult for you to turn your friend around. He has already demonstrated great commitment. What can I do? There may be other people (perhaps mutual friends of you and this man) who are in danger. He may try to get them into this (as he apparently tried to with you). If this was me, I would try to warn the mutual friends of me and him. It's easier to get to them before they have been exposed to the brainwashing. So I would: Yes, I realize this means you're going behind his back, talking to his friends, etc. But I believe these people also deserve to be warned. They are in danger of being adversely affected by what he is doing.