Percentage of cable cost

I've been studying this for over two decades now, and I've found that the sweet spot for percentage cable cost in relation to system cost comes in between 16.7432% and 18.6559%.
For the sake of everyone's safety, I implore you, DO NOT stray outside of those boundries!!

I've had Kimber 4TC 8TC, Morrow SP3 SP4, now have Nordost Blue Heaven. Like them all, but their no better than Best Buy or Radio Shack. The sound is the SAME! Get over it. If you want to spend money for nothing, go ahead.

To ensure that you have a very high probablity of attaining mediocre sound you'll want to abide by the 10% rule.

To attain superior sound you'll have to think differently.

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!