Longer Power Cords Sound better?


In my quest for power cords, i have noticed that a longer cord say 6 or 8 feet tends to have a nicer sound in my system that the same models that are 3 or 4 feet.
Power cords i have found this to be true include Cerious Tech, Cardas, and VH Audio....anyone have an explanation?

AND by nicer sound I mean they tend to have a richer midrange, and a more coherent top to bottom presentation.
ie
I agree, that's exactly the reason why I have 100ft. Home Depot 12awg extension cords on all my equipment!
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Might the length have something to do with whether or not the cord acts as an antenna for picking up RF? Anyway, I've got a limit to how much I obsess about things, and this one just isn't worth it to me.
well.....obsessing or not...if an 8 foot cord "DOES" the job better thana 5 foot....would it not be worth the extra $100 or so...considering that one could spend say $2000 on a pair of ICs that might give only 10% more performance than one's old ICs.....and some manufacturers and hobbyists believe the power cord makes the biggest difference and should be the first to be upgraded....as do I