Couple of years back I bought a nice (I hope) hi fi -
Cambridge Audio, CD, amp and I think Monitor Audio speakers... I was running some heap of junk and I got a good bonus from work so I thought "why not?". It's a mid-ranging system on the scale of things, probably. I'm sure true audiophiles wouldn't be seen dead near it...
Anyhoo obviously I needed speaker wire, and I'd planned on using
the standard RCA cables I already had hundreds of, and just stripping back one end as the speakers are direct wire contact, not RCA, but sales dude tut tutted and said "No, that just won't do!" and decided that, given the position of my system in the galaxy of options, that a mid-ranging speaker wire would do... so he cut me not a centimetre more than he could get away with at some ridiculous cost per metre, and he had several grades above to choose from as well.
This stuff's about a cm thick as it is, and I saw some of the more expensive stuff was thicker still, and I'm thinking "Do we really think it will make THAT much difference over a metre run?" but I didn't argue - I wasn't as knowledgable about sound then as now, and it wasn't much in the overall scheme of spend on the stereo.