This was especially problematic during the dot-com bubble. This town filled up with MBA-holding locusts and greasily slick smooth talkers. They were in it for the money, and nothing else. Of course, most of their businesses failed, and they went off to plague somebody else. Good riddance, I say.
The problem still continues, though, and it's not limited to high tech. The big MLM scams are funded mainly through taking money from idiots who believe that they'll quickly get rich through this exciting new turnkey business opportunity, even though they've gotten totally screwed on the last three. You want some data points, go to an Herbalife convention.