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
I think that the sonic effect of replacing fuses depends on the particular circuit design, and the position of the fuse in that circuit. When the entire audio signal passes thru a fuse, the effect of the fuse on sound quality can be marked. In the Rogue Cronus Magnum II, Synergistic fuses greatly improved the sound quality - more than interconnects and power cords.
Experiment if you can afford the fuses - not cheap though.
@geoffkait 

Just as I expected. Smartass remarks. Absolutely zero wit or substance. 
The laws of physics can't be broken.  If the rationale came in the form of a memo, it came from the marketing department.  Fuses do not make a difference.  Do you want to believe science or do you want to believe marketing?  It's up to you to decide which way to go.
Sometimes I wish science could explain and measure everything...but probably better that it can't