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
Post removed 
@willgolf,

Great to hear that you heard improvements with PADIS fuses. Please do post your findings with SR Blue fuses. I went with SR Black’s last month in my preamp / DAC and they were substantial upgrades over stock fuses.

About directionality, if you end up installing the fuse incorrectly you should hear vocals slightly masked in addition to highs rolled off as @nonoise pointed out.

One more point, if you find SR fuse bit on bright side (and they can be with tube gear) try the HiFi Tuning Supreme Fuse. They are very extremely neutral. I end up going with a combination of SR Black and Supremes in my tube amp / pre and DAC components.

In any case, allow atleast 100 burn-in hours with your choice of fuse. 

Have fun and enjoy music! 
The key is price! The more you spend on your fuses, the better they sound. One should spend many many thousands on a single fuse to be a worthy audiophile. <sarcasm off>
Post removed