I wanted to see it from the inside so I was there to see how it worked... I could only do that by pretending to promote it...
Stop kidding yourself and others. You saw that people were making money and you wanted to make money as well. It is completely human and something many people have done mistakenly.
I don't think you actually believe yourself that you were only there to investigate... And if that is true, then it only makes it worse because of how irresponsible it was to promote something you knew was a scam.