is there any point
Yes there is typically a reason for doing so, although your results may vary of course. Many of us use cabling to taylor the sonic signature to personal preferences. If you change the mains cable and find a difference in sonic signature, then you'll know that your rig is sensitive to such variations. Then you may want to audition a few or even numerous different cables in order to determine which signature you most prefer. Of course if you detect little to no difference, then indeed what would be the point? As in much else that we do, experimentation is generally the key.
