Power Cables diminishing returns

It's possible a $1000 power cord could be 3x better then a $500 pc. It all depends on your system's synergy. On your system page you have several different pc's, have you rotated the cords on your electronics/conditioner? This could end up being a free upgrade.

Obviously diminishing returns apply to life in general.

All my power cables are Audience E's. As far as I'm concerned, they're hard to beat for the price.

I completely agree with you, where would you say the price point representing the best value lies

Unless one burns in the power cords on a cable cooker and or cryogenically treats them, in addition to the usual break in, I suspect it's very difficult to say one has really gone all the way with a particular cord. The costs for burn-in and cryo are relatively small.