I think they are using cardas wire, where every individual strand is coated in a PVC resin, and then there is other shielding on top of that. I have the 2 wire 1960s, it retails for $1100.
To be completely honest, it sounds better and clearer than any other copper cable I have ever heard, and highs are extended like on a silver cable. Tonality is spot on.
How much does that PVC coating cost? Probably next to nothing. Should they be charging $1100 for a 4 ft cable? No.
But compared to other cables that go for 300-500 dollars, is it a sizable step up? Yes.
If I bought wires from cardas, and knew someone who could build a cable like PW audio (for cheaper), I would jump on that in a heartbeat, but as it stands, this is the best copper cable on the market.
That market says $1100, or in the case of a 1950s $2500, people pay it.
The difference is audible, and substantial, the price is "very" debatable.