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
it's like power cords, easy to change yourself, so rather than ad cost for a part you might not want, they use cheaper ones and let you choose your own upgrade...or not
Exactly! Besides from what I can tell audiophiles are very particular about which fuses they want. So it's a lose/lose situation for the manufacturer.  Ditto audiophile power cords. Why should audiophiles trust the ears of the manufacturers? Now, if the manufacturer is smart, which he probably isn't, he would use an aftermarket fuse in his amps for the shows. You know, to get a leg up on the competition.
Same reason MOST companies don’t supply NOS tubes for stock ... matter of personal preferences, no best! Let owner decide/roll for themselves.
Because Amplifier manufacturers haven't got a clue - if only they knew that amplifier design and sound has nothing to do with the audio signal and related components and everything to do with the 1cm of fuse wire on the mains input. 

/Sarc off
"I can tell audiophiles are very particular about which fuses they want."  

+1 @geoffkait & @joecasey 

Let your ears guide you what sounds best in your system! I would like to add, don't get sucked into marketing hype with any tweaks. In my system, the combination of SR Black Quantum and HiFi Tuning Supreme Fuses sounded the best. Every component is unique and a bit of experimentation is the key when implementing after market tweaks.