What are fuses used for?

It’s explained by the fact that people spending 150 bucks on a fuse really NEED to hear an improvement or they feel like they’ve been duped, and also feel the need to join a support group (like the ones here) for the same reason. Most audiophiles and gear manufacturers (like Roger Modjeski) don’t care at all about "magic" fuses...what explains this?

No offense taken there Kaitty as my skills come from over 5 decades of on the job experience as a working musician with no time for whatever Acoustic Engineering School might offer. My experience of working with those having been "trained" varies from smart and talented people to those with zero aptitude or talent. Ya never know. I get these live sound gigs from reputation only...sorry Kaitty...I know this bothers you, and my interest in audio has also been due to many years of practical experience, although it's only been during the last 30 years or so that I've been able to afford the gear I want, and focus on hifi instead of the musician gear needed to play live constantly as well as do personal and commercial recording work. As an aside...in the fourth grade I was trained by somebody in the audio-video department of my elementary school to run the 16 millimeter projector for a teacher with severe "projector phobia"...they'd take me out of my class from time to time and off I'd go to wheel a projector set into her classroom, which I thought was GREAT. That's where that stuff started I suppose.

Some crafty manufacturers found that by claiming a lot of nonsense about Special fuses made with beeswax or silly pseudo science, with very little rational explanation of why they could make this magic: "New UEF Graphene coating, two years in development, and UEF quantum treatments make the BLUE fuse significantly more holographic and dynamic than even the incredible SR BLACK fuse. Resolution and musicality are second to none"...like that...would make some easy tweak bucks...that’s pretty much it. If 40,000 hopeful and faithful bought in, as says Kaitty, that’s just sad and likely inaccurate, but far more than 40,000 HAVEN’T bought in (they perhaps haven’t heard about the astonishing benefits of fuse "upgrades"). For weird reasons better explained by non-layabouts, Conference Call Kaitty has issues with the fact that I actually did a pretty thorough test, and am a successful (admittedly frequently overpaid) live concert sound engineer...likely more fun than being an imagined Audio Insider.

I tested some "premium" fuses a while back after disputing the insane hyperbole attached to them by a few shameless salespeople...I figured it would be interesting and I had access to a pile of 'em...I found them to be absolutely useless relative to SQ, and some were actually rated improperly and blew in a power amp.