I do agree with with original post. There has to be some kind of show put on by the performer and forgetting about the visual side of it can downplay the aural aspect of your performance. Case in point for example would be how I couldn't imagine a band like Roxy Music looking or sounding other than the way they performed:
Likewise someone like Kate Bush would in my opinion suffer if it wasn't for her own stage precense, the look or the visual of her performing the music:
If you're having someone pay to see your show at least provide some eye candy that adds to your music. If not you'll start looking like those laptop acts that bore the hell out of people quick.
What would the Beatles be if not for their overall aesthetic; mop tops, mod wear to psychedelic garb an all?