I apologize for not being able to get past the title and first sentence of this post without being critical. The title is "High End Audio is a Big Zero" when what you meant is "High End Audio Dealers are a Big Zero". High end audio by itself is just fine and every once in a while (but not often), worth the high prices that are paid for it.
And the first sentence is: "This is no knock on dealers." and then you go on to spend the rest of the post knocking on dealers. The dealers may very well deserve to be knocked on but don't try to obfuscate what you're doing by starting with a counterclaim. Be bold and knock away.