Try not to worry about 'having' to spend $$$$ on six feet of power cable.
It just conducts electricity and can make no difference to the sound.
Obviously the guys selling it will say it does
Once they say it, then the 'emperor's new clothes' syndrome invades right-thinking people's minds.
If you listen to them and think the sound is better, that is just expectation bias and the wish not to fail to hear what everyone else says they can. FOBLO shall we say - fear of being left out.