inna,
anyone that spends $20,000 for a piece of wire is either stupid or has more money than brains, ask yourself this question what can they do to the piece of wire to make it worth $20,000 or $40,000 or $80,000, absolutely nothing and most of these companies that are charging that are using OFC wire which is the cheapest wire for audio that you can buy, anyone that knows anything knows that OCC single crystal is far superior to anything OFC at any ripoff price and that was proven over 50 years ago already so anyone that uses OFC is behind the times and as for speakers there's only a very few companies that use it internally for their speaker wire because it's about 4 to 5 times the cost of cheap OFC junk.