People believed the world was flat, sounds a bit silly nowadays.
If some people don't believe the difference in mains upgrades, quality cables, burning in and interconnects etc just leave them to it. It is they that are missing out, and perhaps they just don't care.
Just enjoy the music.
Samsung LE46M86, Onkyo 875, Sony PS3,RDR970,BDP-S350, Modded MA RS8,RSW12,RSLCR,RSFX. Soundstyle WG3AV, QED SA XT/Kimber4TC,Classic Powerkords, Audioquest Quartz interconnects, Mains:-shielded spur. BT MTU's, Bi-amped fronts /bi cabled fronts,centre.