So what do I do? Continue to let the investors take these horrific losses?
yes, nobody is forced to invest or stay invested.
Agree with jabetizo. But I've also not seen you, dooglus, take the possibility seriously that he has exploited your site.
As you aren't invested you don't have skin in that game (only skin in the 10% free option). As a potential investor / sender of money to your site, I find that confidence worrying.