Cables, and to a large extent HiFi, is Jewelry.
Some cables are extremely complex to fabricate and can somewhat justify their pricing on that basis. A large part is to drive marketing as in "The same technology in our $40,000 cable is used in our $400 ones."
What really gets my goat is companies like Nordost and Audioquest with their demonstrably bad geometry and silly names. By their design, these cables are tone controls and will interact positively in some instances and egregiously awful in others. Salespeople blather on about PTFE, µm plating, etc. with ZERO understanding of why the cables alter the sound.