I think people generally assume that confidence is backed up by reality. I've found that one of the most useful sales techniques is to be friendly and polite but also very confident. People find it reassuring.

Sounds like this guy took it to the extreme though, and lost all perspective on reality along the way.

Hmmm...yes maybe that picture of him in the Bowie getup was the giveaway for that conclusion?

It's all about confidence and perception.