When your equipment is revealing enough that cable differences are significant rather than marginal, then the cost is worth it. And the most expensive cables aren't necessarily better than cables from the middle of the line: you have to listen. In my case the investment in Transparent and Elrod cables took place after intensive and extensive sessions of comparative listening, and the differences were not subtle.
Are expensive cables worth it?
The cost for interconnects ect. are way out of hand! I understand $200-400 cables, but do $2000-4000 cables sound 10x better? I know we are all dropping big coin for that final 10% of music not heard on 'mid-fi' systems, but are the cables the place to find it? I'd rather save the $ and upgrade my speakers or amps first, am I crazy or what?