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
"Because they know better and are technicians "
Well what I do know is that engineers and technicians often talk rubbish, and have ears that demonstrate that their ears seem to be pointless.
And if anyone writes that studios have kit a or b so must be good, then that is even more rubbish. If they knew more than not a lot, there would not be so many bad recordings out there.
But back to the original issue, I recently bought a ps audio power regenerator which came with a stock power cable, and the instructions stated that although a stock power cable was included, they recommended "better" ones should be used as they would improve the quality. So an item that cost rrp around £2,900 uses a cord that cost £2 and comes with a recommendation!? As said above, it seems to be a marketing decision as to what to include or not.
Paul McGowan is very transparent about the power cord issue.  He, like the vast majority of audio entrepreneurs, brings gear to market at a specific price point.  He includes a good, heavy gauge power cord with his regenerators but notes that upgrading from that cable can improve the performance of his gear.  Additionally, Paul endorses his customers to use resonance/vibration control devices with his regenerators and other gear to further enhance performance
Paul McGowan is also a proponent of aftermarket fuses, to bring this full circle, and supplies some sort of fancy fuse in some of his gear.
When I auditioned a pair of Odyssey Audio monoblocks, in my home, I had occasion to remove the covers(with Klaus’s permission). Apparently, Mr Bunge(electronic designer and manufacturer) believes fuses make a difference, given the amps had all the fuse holders(mains and rails) stuffed with HIFI Tuning’s products. Don’t know if he sells them equipped that way though.
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