I understand people who do not believe fuses make any difference and I understand trying to ask for "measured proof". However, I do not think it's cool at all make it one's mission to ensure any new users are discouraged from the idea of trying aftermarket fuses at all. That's almost like a "religious extremist" attitude. If you have not actually sat down and listened to different aftermarket fuses, I really don't think you have any real objectivity to say that "fuses do not make any difference at all". For those who have actually listening to fuses, I think I have seen exactly ONE user who posted that they could not hear any difference (which is totally fine!). All other people on here that have actually experimented with fuses have posted that they do, indeed, hear differences (whether it is positive or negative for them). There is definitely an electrical character that happens with fuses, since they are inline to transfer current/electricity. The same goes for power cords, interconnect, speaker wire. I think there are definitely a few things about fuses that can dictate how the end-result sound is:
- conductor material, such as silver, gold, copper, and tin can contribute to the character of sound (just like power cord material).
- conductor / end-cap plating (such as gold-plating, silver-plating, rhodium plating). Just like power cords, this can influence sound from A/C current.
- internal conductor material / damping (such as filler material or liquid - like beeswax or power type filler). This helps reduce electrical resonance that happens on that very small wire. The glass tube or ceramic tube can also affect electrical resonance.
The above points can probably be measured in some way (there is definitely measured results on the conductivity of different materials such as copper/silver/rhodium). Though, I'm not sure anyone will really sit down and actually do these types of measurements on fuses because, at this point, it doesn't really have any fiscal value to do. There is no "return on investment" to spends thousands or tens of thousands to do these level of tests.
As far as cost is concerned, it's all about perceived value and "what the market will bear". In my testing, I definitely have no problems spending $60 on a fuse upgrade. I'm not to the point where I want to put $150 on a Synergistic BLUE, but many others have and love their fuse. Though, I can understand other points of view. Just like why a person would drop 6 grand on a Rolex watch when you can spend a few hundred to get a nice item that does the same thing.