Why don't amplifier Companies use high end fuses?


My equipment - Raven Integrated Reflection MK2 tube amp 58wpc. / Lumin A-1 DAC Streamer / Synology NAS / Isotex Aquarius Power Conditioner / Furutech Rhodium Plug / Sonus Faber Amati Homage Tradition speakers.  

I have read thousands of comments on upgraded fuses improving the performance of sound.  I am very open minded but not sold either way.  So, the question I have is....if fuses were so important, than why don't Amplifier companies all install them as OEM equipment?  To me, if they are as good as people say, that would provide companies who use them a competitive advantage?  

Every High End Audio store I go to in Phoenix have told me it does not make a difference and is a waste of money.  For the record, I have fuses purchased at an automotive store for under $10 and I think my sound is awesome.  The Company that built my amp tested the Synergistic Fuses and he emphatically said there was no difference.  

If I were to try a fuse for fun, given my equipment, what would your recommendation be to try?  
willgolf
Just to be clear, there was no "proof" of anything.

A fuse was changed and he heard a difference. Resetting the original fuse with better contact may have produced a difference as well.

Almarg and Atmasphere have both stated this I believe and that is consistent with my experience as well.

Again that’s not to say all fuses are created equal and some may in fact work better than others.

So the truth as in most cases is most likely right square in the middle and extreme views or blanket statements do not cut it.

Expensive products with nothing to back up extreme claims should be questioned. Those who object are helping nobody but the vendor. Personal attacks should always be right out. The usual high end audio story.
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Mapman, sadly, the mildly interesting theory of the flakey fuse holder was debunked. Didn’t you get the memo? 😳 Your excellent use of name dropping notwithstanding. 
The same people who posit that removing a fuse and replacing it also say that rotating the fuse in it’s holder can achieve the same result.

Did anyone double blind that doosey of a claim?

Think about it. From head on, a fuse is officially round. The fuse holder arms are shaped one way only. How could rotating it extract a more significant hold on the fuse? If it could, it would be of such an insignificant amount as to amount to none at all. We’re talking many places to the right of .0 and I’m almost certain it would be a much greater difference than what is measured when fuse direction is changed.

And yet, we are told to believe that that is more believable than changing direction.

All the best,
Nonoise
@nonoise  I could be mistaken but I believe the argument made by fuse skeptics has been that merely the process of removing one fuse and inserting another is, through the friction involved in that action, removing oxidation from the fuse holder giving the reinserted fuse a cleaner connection to the holder and thus a perceived improvement in sound.