So narcissists (as in people with NPD), if you've never had the unfortunate "opportunity" of being around one, are often incredibly good at convincing people to follow them. Take from that what you will.
People are attracted to self confidence, because most of the time people who are openly confident (down to the minutiae of body language) are in a position to be confident. The ability to simply be insensitive to the normal stresses and worries that would inspire rational doubt can put you in a position to lead.
Of course, you'll be leading with coin flips, and most people will fail. We just pay special attention to statistical flukes who make a lot of money before they flip out.
