Knowing that you use $10000 cables can make the music sound better to you... but it's mostly in your head.
Regardless, you can't deny that there is a difference in quality between different brands of cable, but any rational consumer would not be objected to AB-X testing when buying such things. There's a point where each additional $100 per foot no longer makes a difference. And no boradcast or production studios where the audio and video is recorded mixed and mastered buys into claims by companies such as Audioquest or use cable cookers. Yet these are the places where cable runs may be hundreds of feet and where preserving signal quality is of utmost priority. If the studio already ****ed up your signal using "cheap" wire then there would be no way to revive it again even with Nords.
But still -- if they sound better to you, or if you just feel better knowing you own them, then it may just be worth the extra money.
But there is a point of diminishing marginal returns--past this point money is usually better spent in other areas (where the difference may not only be audible, but scientifically measureable as well). Just think before you drop 10 grand on a pair--could this not make a bigger difference elsewhere?