This is all "risk profile" stuff. If you have the stones, by all means, feel free to "invest" with these "people".
The more legitimate information an asset seller provides, the higher the premium they should be able to command. If it's SLKRD.ETF with nothing behind it but a nom de guerre of "FUCKDAPOLICE", well, good luck on that one.
This is grown up land and you have the right to make choices that I might call completely fucking stupid. (I will, watch me.)
I think that many people on here are actively seeking illegal investments rather than believing that the schemes offered here are in any way legitimate. Perhaps they believe that there's less risk of being caught if their illegal activity takes place online or perhaps they don't have the real world connections to participate in high return illegal activity, but people were perfectly happy to keep throwing BTC at pirate when it was believed he was using them to launder money for unsavoury clients. I have no doubt that if someone offered shares in a child porn distribution ring or a cocaine cartel on here there'd be users scrambling to get in on the action.