I think we all have seen the $350 wooden control knobs.....
Remember a while back someone was pushing the $350 power cords?
I think the response was, how does the last six feet of power cable change the 50ft of power cable to your house, not to mention the house wiring.
I believe the audiophiles are just into their hobby such as we are.
There have been pretty hot debates about caps before and metal verses carbon resistors, etc.
The Hi Fi gang get off on expensive gear which is fine to me.
I'd bet they cringe at the stuff we do to amps.
Just don't try to make my guitar amp too hi fi.
