You are right and i think the same thing as a general rule...
But my system value being only 1000 bucks, it was not easy to stick to 15 %...
My actual set of cables are 30% ...
There exist a minimum price for quality....
I paid 100 bucks for a Morrow cable M3... The other cables cost less ...
Cables makes a difference but less than the others factors most of the time ...
The total cost is not really indicative IMHO . What is more informative and pertinent is the percentage relative to the total cost of the system, I read a long time ago that a ratio of about 10-15% is recommended.It has been a useful guide for me.