The one that got me was the HDMI cables for £150 (possibly Chord) that improved motion, colour, detail and sound. That was my first negative thought about reviews and the publication which I was quite sad about.
What hifi did a blind test of blu-ray players I seem to recall. Some people preferred the picture of the cheaper Sony than more expensive players IIRC. I wonder if nothing had been changed and those viewing were asked to look for differences, if they would have found any?!
I would like to see some objectivity in the review process and some 'science' to explain differences in sound, picture or any other relevant variable, depending on the item under review.
The television reviews are the ones I look at most as a subjective opinion is more relevant I think.
As for cables and racks, not convinced at all.