I was approached a while back by a person who advised a VC (unnamed) about a technology, and I looked at it and saw several points of, well, garbage. I wrote up a one pager with the pros and cons and emailed it, got paid a little bit, never heard back.
The "spin" was well done, very professional, it just overlooked two huge obvious issues, or ignored them to get money. I thought maybe I'd get more "business" but never did. It would be a nice sideline.