Power cable education needed

My previous comment also begs the question, if the power cord needs to be triple-ought gauge, quadruple shielded adamantium for audio to sound decent, imagine how much better that $800 cable would sound if 100% of it's current didn't have to travel across the 30 gauge filament of the fuse you got for a couple bucks.

It's hard for me to explain, too. But, let's say you're replacing a power supply for your laptop or something. You need one with exactly the same voltage, probably 19, but the amps doesn't need to be exact. When the laptop says the power supply is "19V, 5A max," it means 5 is the max amps the device will ever use. So a 19V, 10A supply won't hurt it. The only reason it would draw more power, measured in watts, which is volts x amps, is if there were a short inside the unit, or maybe you attached a 32V supply, or something. In that case, the fuse will burn, cutting all power. Putting a larger fuse in your amp won't supercharge it. It only puts the component in danger. It's like bungy jumping off a bridge and adding 30 feet to the cord so you'll have a longer ride. 

They don’t limit anything. They burn up, dutifully sacrificing themselves so your transistors don't.

the component relies on the incoming fuse to protect it from getting hit with too much power

Uhhh.... fuses aren't current limiting devices. Components draw as much power as they draw, all according to Ohm's law, I=V/R. Put a 10 ohm resistor across a 10 volt potential, it will draw 1 ampere of current for 10 watts (I*V) of power. If you put a 300 amp fuse in front, it still draws 1 amp, because, well, 10 ÷ 10 = 1.  Not a problem if it's a 1 watt resistor. But if it's only a half watt resistor, a half amp fuse won't "limit" the current to half an amp. Its filament will melt, releasing the magic smoke that limits the current to exactly 0 amperes, and leaves the component's magic smoke fully intact.

As far as the power cord, I don't know what they bring. Certainly, you need one that is big enough to supply the current needed. An 16 gauge copper wire is rated for about 20 amps, way more than any consumer grade amp. In fact, your electrical panel breakers are probably only rated for 15. Also, a shielded cable can block RF noise, but only for the length of the cable. It won't do anything about the noise the line picked up from the power station to the outlet you plug it into

I personally know families of four whose monthly food budget is less than your "low budget" power cable, and not a single post here can articulate what exactly the return on 'investment' is.
When someone says they couldn't believe their ears when they tried a $600 cable, they're either selling snake oil, or trying to convince their wife that they didn't buy snake oil. Again.