Well of course they do. You can't legally counterfeit money but you can make a power cord for 500.00 and charge 10,000. If I had the knowledge about how to make a great power cord I would start a company tomorrow. The profit margin on these products are beyond Insane. If I ever was going to buy and expensive power cord I would buy them from a well known company that has distribution. At least that way you could resell them down the road and get some of you're Investment back. If you buy a cord from one of these obscure companies there may not be a secondary market to resell them.
Power cords at ridiculous prices?
Seems to me there's no shortage of "black magic" out there, people spending $1000 on power cords? If the equipment you own is well designed with hefty power supplies and adequate capacitive filtering on-board, the grunge from the AC lines will be dealt with. I'm not discounting upgrading stock cords with something of a little better quality, but it seems to me spending the equivalent of a mortgage payment, on a piece of wire, makes us audiophiles the subject of ridicule by any reasonable person. Okay, I'll stand back now and take my lumps....