Most of my cables cost between $0 and $20, also a 12m AQ CAT6a at about $3/m because it is the only custom one I could get terminated and tested locally. I used to use $1.50/m Sommer speaker cable, but on a recommendation tried some speaker cables that have vanishingly low inductance and a design that seems to make them impervious to noise pollution, I bought those, and someone loaned me a power cable that seemed to lower the noise floor (it seems to have some form of network in the socket) so I bought that. I’ve spent more on a pair of tickets for a night out (box office prices). The power cable was given to me unboxed and it was unbranded.
I‘ve fed my streamer with both fiber and $10 CAT6a - no audible difference - and output using usb (a giveaway cable) and CAT6a - no audible difference. So I’m not inclined to try expensive Ethernet upgrades. But I have with power and speaker cables and I’m not open to being told I didn’t hear what I’m sure I did hear.
the USA does seem to have an obsession with cables that does not exist elsewhere.
Or look at it another way. The Industrial Revolution enslaved people in factories, destroyed agrarian society, and ultimately is destroying the planet. Those are of course averages and it is really only the exceptional people who make a difference, 99% are just fuel for the wheels of industry, and conventional IQ measurements mainly correlate with people seeking the most financially lucrative education. Do these things bring happiness? Travelling in parts of Africa and Asia where there is no TV, cars, certainly no planes, a healthy diet, little stress and traditional medicine, you wonder who are the lucky ones. And they don’t need audio systems because they can make their own music. But if you want to think engineers are at the top of the pecking order for the sake intellectual superiority, that’s up to you. I’ll go back to my book by a man brought up on a farm with only three years of formal education that ended at age 16. Don’t think he ever had an IQ test, but he won a Nobel prize for literature.