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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
So here's the sad truth. He might actually be making a return on his investment. Not because it's right or because the system works, but in all these schemes there are a range of people that actually do make money.  In addition to that, there is that fact that he "believes" that he is doing a good thing, and is unwilling to discuss it.  So, if he is making, even a tiny return, and really believes that he is making a large return, or that that large return is just around the bend, your never going to convince him otherwise.  You have two real options; If he will listen, go though and look at money in v.s. money out. If money out is larger then money in, your screwed.  Make sure to point out that he should look at real money in (left a bank account) and real money out (deposited to a bank account). Again be prepared for the fact that he is actually making money. Some people in the pyramid will make money, it's just never as much, or as many people as they make it out to be.  Don't attack the system, attack other aspects. Try and argue liquidity, or FDIC insurance. Again not trying to show why the system is bad, but why a investment in foo instead may be better. If nothing else, go with diversify. Never put all your money in one spot, even if it's a really good spot. At least in that case he will have some money left over in the end. That said, your friend may not go for it. May just put on blinders, and may just stick finger in ears. Move to option two. Respect his wishes, and set boundaries. "Ok, I hear you, you like system X, I won't bring it up again. Do me a favor, don't you bring it up again either. Let's just leave this with religion and politics." If he continues to bring it up, then when he does, just point out you agreed not to discuss the issue, and if he continues to push it, rethink your friendship. If you both respect one another, you should be able to respect each others' decisions.  If you can't then, sadly, you may need to stop spending time with one another.