Percentage of cable cost

Ten percent works in my HT but in my analog 2-channel it's closer to twenty five percent.

The cables do matter. Assigning an appropriate price is another matter. I am guessing that I have invested about 10-20% depending on the system they are in.
I can't imagine spending the kind of money I see spent. I think a more interesting question is how much is the most you have spent on an individual cable. In my case it's the speaker cables on my main system about $650 for entry level used Jena cable copper braid. To people outside the hobby I am sure that sounds insane. When I see speaker cable for ten times that -- well that's clearly over the top!

Out of curiosity, how many of you have ever done double-blind tests on cables? I suspect the results would be interesting.

Check the Stereophile website for a report on a blind cable test done in Minnesota. Good reading

I just read the test. Interesting, indeed. Not totally scientific, but the $8000 cable didn't beat the $3 cable by that much.

A few years ago, a noted economist did some double-blind wine tasting tests and found that even the so-called "experts" could often not distinguish between very expensive and very cheap wine.

Makes me wonder.