Well, the Decware cords are a great deal for the money, in my opinion. It's not subtle the difference they bring to to the table, and the improvements keep bringing results when other changes are made to power conditioning, isolation etc.
I was a skeptic some years back but I have come to really believe in the benefits of a great power cord.
My Audio Cables (MAC) actually makes the Decware cords. You can purchase their cords on audiogon auctions very reasonably. For example right now:
http://cgi.audiogon.com/cgi-bin/search2.pl?seller&PcwizardSo I would say the answer is "No, you don't have to pay so much."