Whenever I see a cable thread on PFM I always end up wondering if I've actually landed on a forum aimed at audiophiles. Dop any of you actually own and listen to audio equipment? I really don't understand why expensive cables are hard for some people to understand when expensive amps and DACs aren't.
I have expensive cables in my system - my RCA and SPDIF cables, made by Z-Axis Audio were about £2200 each for a 1m pair. My speaker cables were about £3k for a 1m run and my interconnect retailed originally for a whopping £7k (although it is 5m long and I got it for cost at £2,600). The mains cables were about £1000 each for the ones on the power amps, but I use MCRU £150 jobs for the other electronics.
In the context of my system the total spend on cables is about 17% of the total. They were the cables I opted to buy becuause they gave me the results I wanted when I listened to them. these improvements were objectively assessed and easy to assess. The choices each broght significant improvements to two main areas: bass response was the first and most obvious improvement, especially with the use of silver in the signal loom. The other was improvement to the leading edge of notes; that PRAT thing. Importantly that improvement never made the music sound fatiguing like Naim PRAT tends to do.
The price was something I could afford so that's what I bought. I compared them to other options available and was happy to spend the money, just like I was really happy to spend the money on my whole system. Having watched Paul at Z-Axis hand make his cables I can see why he has to charge what he does. The material cost (in his cables case, pure silver), is very high and he makes the cables by hand in a very intricate way so it's time consuming.
I don't think price is really the issue here though - maybe it is value. It's very easy to find expensive cables that don't work in your own system in a way that is pleasing and also not difficult to find inexpensive ones that are. The trick is to find the one that is best for the budget you have. If you have patience, an open mind and aren't actually deaf, then cables are an excellent way to fine tune and optimise your enjoyment of the music.