@Audiolabyrinth, I am not suggesting that all expensive power cords are over priced. What I am saying is that I find it hard to believe that spending $10k on a power cord will provide the biggest bang for your buck for improving the sound.
As an example say you own an amp that is worth $10k and your not entirely satisfied with the sound you look at all the alternatives and you have determined that an upgraded amp would cost 5k more than what you have. Alternatively you could spend say 1k on power cable that would provide a similar benefit. Clearly the 1k power cord would be your best choice.
Now assume the cord cost 10x as much, clearly upgrading the amp becomes the better option.
Assuming my first scenario holds in general, then $10k power cords would only be sold to people owning $100K amplifiers. But now you must ask the question, if you pay $100k for an amp that amp must provide the absolute sound! If a power cord, $10k or $1K, can further improve the sound then where is the value in the amp?
Basically, in the cost is no object domain, when you buy a piece of gear it should be the absolute best and provide the absolute sound, the manufacturer should be tasked on finding every optimal sub component of the unit, be it power cords, power supplies, caps, resistors, whatever as long as it is optimal. If this is not the case then in my humble opinion something is wrong.