Does long hair destroy the soundstage?

I think that it's obvious that anything over your ears will have an effect on the sound. Having hair over your ears would be expected to muffle the sound.

As for this being related to the demographic of audiophiles, I'd say this is a small factor.

In my opinion, a significant part of the audiophile "bug" is related to the enjoyment of having and tinkering with the equipment. How many women do you know that truly enjoy tinkering with electronics. For them it's significanlty more about the music and, in my opinion, when it's all about the music the system isn't nearly as important. As always there are exceptions, but swapping expensive speaker cables for a minor difference in sound isn't evidence of a listening being all about the music.

I would suspect the majority of the benefit from removing one's glasses is that if you can't see very well to look around the room you'll be forced to focus more on the music. Ever close your eyes while listening?

As for Kenny G, who said he was an audiophile? It was simply stated that his music is geared more for women than men.

I generally prefer the sound of my speakers with the grills on, but Focals expose the tweeter above the grills. I did prefer the grills off on my previous speakers where the tweeter was covered.

I really like the strength to hair length reference, great! If it's true I should be bald.