I see some interesting thoughts here. I agree that pretending to have magic powers is not a good way to perform. That being said, I think the concept of doing tricks so powerful that audience has no explanation other than believing in magic is completely orthogonal to an idea that you are supposed to brag about having paranormal abilities.

I think the art of magic is ought to be performed live. There some guys who got it right on the TV, for instance Copperfield. The problem with YouTube on the other hand, is that you can replay the video anytime, so this kills misdirection entirely.

The way I get around this issue in my promotional materials is that I basically only show people’s reactions to my effects, so that people see what they buy. Entertainment, not tricks to figure out.

On a side note, I love how Derren Brown performs. He says up front, he has no psychic powers but provides some basic pseudoscience explanation to his audience which is a trick on its own!