oddly enough i almost had to replace my hd555's cable just 'cos my iron nearly melted through it >_<
1) yes, i did exaggerate a bit :) but hearing is a sense that happens inside the brain, and is affected (thankfully, else it would be useless to us) by tons of other things, probably even the colour of the walls...it is emotion afterall...
2) no really, whenever you look at something, you see a pinpoint bit in actual full detail, the rest of your vision will be unfocused - your brain is just 'filling it in' with what you expect to be there coupled with what the eyeball 'reports', only focusing on movement (again, this is very useful to us, making the most out of our eyeballs, sensitivity and full detail where needed)
3) never said you did, but you made out like hearing was some amazing thing that has served us for millions of years...indeed it has, but nothing to do with hearing differences (hearing, is to do with the brain, not just the ear...) in cables, that's not what it's for nor remotely capable at.
so barring stray soldering irons and my lax attention, why would i replace my headphones cable when nobody can tell me why or how the cables affect the sound....i'd have to be quite gullible to 'buy them to see for myself' (i would only trust ABX as i am fallible like everyone else) considering i've ran a battery of my own tests on seeing how bad i can make a cable before i hear a change (it took a single tiny thread of grubby copper wire as an interconnect before things sounded kinda 'off', and digital cables either worked or didn't.....)
perhaps the cardas does brighten the sound, such would be easily measurable by a machine.