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
Take any amp, replace it's fuse with a high end fuse, and it won't change at all and will sound exactly like the identical amp with its normal fuse.  If the listener knows which amp has the high end fuse, that amp will seem to be better as, after all, it must be…right? To save time and money, just tell people there's a high end fuse in their gear and they'll know it's better even though it's not, and people save money and are happy. 
Post removed 
@geoffkait , why are you still falling for the bait. You and I know better, as well as many more of us do. Let kosst, wolf, and anyone else on that side of the fence, be.
I like bait. Bait is tasty. Mmmmmm...🐟. By the way you got the story wrong. The Japanese amp was an ultra low THD amp and was compared to a much higher THD tube amp and the tube amp was judged to be much better sounding. But that test had nothing to do with Julian Hirsch, although it’s a good case for the anti measurement crowd. 😀 I am not here to debate either. 
Take any amp, have a friend replace it's fuse with a high end fuse or pretend to

then, you listen and guess A or B

do it 20 times and report back

I will give a free liquid-metal filled goop egg interconnect cable to anyone getting it right 19/20 times

or even 18/20