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
@willgolf, although you were the OP on this thread, you did open a can of worms. I noticed it has been over 2 months since you contributed to your own thread. However, I am with you, and I am, at this point, out. I know, what I know, because I try, I listen, and I evaluate, for a change, whether positive, negative or none. Thank you all, MrD. 
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The reason I have not responded in two months is simple.  It turned into a hotly debated subject with neither side willing to lose.  Second, I accomplished my objective in trying a few different fuses.   Third, I shut my email off regarding this subject because my in box was getting overloaded by the responses  
Very unscientific, but I thought the sound improved with improved fuses in my gear in my environment (Synergistic).  I did blind A/B testing with a friend and (unknown to him at the time) he preferred the Synergistic over the stock fuses. I put them in all my audio gear now (the ones that have easily-accessible fuses). Really enjoy the sound of my systems!
I'm thinking some smart entrepreneur could sell gold plated circuit breakers.Would be a great business.Maybe some special wire,going from the panel to whatever outlet is used.