I have to say that that particular experiment pretty much did it for me; My Arcam Aplha 8se has two outputs and having been lent some kimber cables to try out I compared my diy silver interconnects with the kimber cables, then my silver cables against my diy copper cables, then those against some audioquest cables etc etc. The result? Much guffawing from my other half who though the whole thing was, well, laughable, and much annoyance to me as I was forced to admit that I couldn't hear any bloody difference between any of them. This despite me being utterly convinced of significant differences when I'd previously 'upgraded' my cables.

I never went as far as comparing the really cheap shit freebie interconnects with my other pairs, as I was too worried that I wouldn't be able to tell them apart. 

That said, I still use the interconnects that I originally thought I preferred, as I still find it difficult to explain the 'obvious and immediate' differences I'd heard in the past and conscious that if my mind/hearing could have been deceived once, it could've happened when I did the A/B tests also......so basically I'm hedging my bets!  What's more I've also been contemplating 'upgrading' the internal wiring in my speakers, so there's probably no bigger audiophool that me!