Why does an audiophile grade power cord matter?

I hear the difference I just haven't heard an improvement. I had 2 pair of Quicksilver monos. One had the original power cord which was the equivalent of lamp cord and nonpolarized the other had an IEC socket installed with an "audiophile approved" power cord. Guess which amplifiers sounded better. The amplifiers with the original cord sounded better. I have also tried numerous after market power cords with varied results in several systems. If there is something wrong with the sound of your system and you need to smooth something over or brighten something up you might be able to do it with an after market power cord. I prefer finding the problem.

I never did 'believe' in special powercords either. I tried a few homemade cords.. Then a Pangea only because it was as cheap as i could make myself.
Well, the Pangea did make a difference i could hear right off.
So eventually i bought all Pangea powercords for my IEC use electronics.
I am certain someone can come up with a BS reason which could convince others as to 'WHY' they work.

I have only my fantasy theory.. So if YOU like my fantasy theory, then you too can claim you'know' why cords can make a difference.

IMO it is the last few feet of powercords can dampen to sloppyness of the waveform, and help make it a single waveform. Reducing "SMEAR" sort of, in the AC waveform.
that is MY 'theory' of what aftermarket powercords do.

From the results of all my own fooling around.. That is the fantasy which closest correlates to what i hear when messing about whith my toys.
When adding various stuff together, or not, seems to 'thin out the sound, which I take as making the waveform so tight and thin it actually reduces the power.. Or making broad and more powerful..'See my theory sucks as soon as i try to overindulge in it.. But it works for me.

Eliz....I've heard the same thing before...and to THESE ears, the right power cord makes the most positive difference.

Please define "audiophile grade".

Thanks.

Why do cables or NOS tubes matter? It's the same thing as in most of audio, it cannot be explained, only heard or not heard. I didn't buy the fact that a power cord could make a difference either, but listening has changed my opinions.
If you can't hear the difference, count your blessings and move on. :)