I don't think you're crazy.

I have 3 Yamaha M80 2 channel amps and have replaced the OEM power cord on one with a heavy duty power cord and hospital grade plug (the rest to follow), same for the Ah! tube output CDP which now has a HD power cord hot rodded from the manufacturer. Folks who have bought the Panasonic XR series digitally amplified receivers have noted the improvement in sound quality from adding an HD power cord.

If your mom has heard the difference, who could argue with you?

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.