This is, after all, a performance art. Take, for example, somebody reciting Shakespeare to only himself. There's another word for that--crazy. You're not crazy, are you?
Crazy? I was crazy once, they locked me in a room, then they buried me, then I died, and then the worms drove me crazy! Crazy? I was crazy once, they locked me in a room, then...
All jokes aside I do believe that many of the videos should be filmed infront of an actual audience. I think (well actually know) that several people who call themselves "magicians" infact and some times never perform infront of people. They just buy the effects practice them and practice them some more making videos of them doing it for feedback, but they never perform. Yet they still call themselves magicians.