OP, here. I took @grislybutter to be intending a claim that was missing two words.
Here's the claim as I think it was intended:
"20 dollars cables vs 2000 dollar cables *can sometimes* make the littlest difference"
This seems indisputable.
@larry5729 I bought a 14' length AP Crystal Solo Oval 8 single speaker cable from TMR for $600 and I paid the company $130 to cut it in half and re-terminate it. Brand new that speaker wire would have been $2661 as a pair of 7' cables. There are ways to get value without buying new.