I just don't get the point of these discussions. I, personally, would not spend that kind of money on tweaks, and wire; I am too cheap for that, and that is no indication of wether I feel they are worth the money or not. But, can I envision a scenario where someone has put together a well chosen set of components whose basic sound he/she really likes AND HAS GOTTEN TO REALLY KNOW/UNDERSTAND (!!!), and then proceeds to spend (over time) as much or more on wire and tweaks, to eek out as much performance as possible from them? You bet! Is that a valid approach? You bet!
Example: I own (among others) a pair of Stax F-81 electrostatic speakers. To my ears (and I have listened to a whole lot of speakers over the years) there is no other speaker that has a midrange like the Stax. Some may disagree, but to these ears, that midrange comes closer to the sound that I want, than any other speaker. I want that sound, and am willing (most of the time, which is why I own other speakers) to put up with the Stax's problems, and limitations. So, I have built a system around those speakers. In spite of my frugality, the cables/tweaks in my system cost much more than the Stax's do. Am I nuts for doing that? I don't think so. I have been able to elevate the sound of that fabulous midrange to even higher levels by judicious (I think) choices in cabling and tweaks. End result is a sound that I don't think I could have gotten by allocating that money for any other, more expensive speakers.
I know of so many cases where the audiophile churns equipment constantly, the whole while kidding himself about wether he is getting TRULY better sound by tieng it all together with this and that cable/tweak. End result: mediocre sound.
Agaffer, let's make this conversation really interesting: why don't you name the member who's system you referred to in your OP? Maybe he is following this thread. If so, whoever you are, chime in, and share with us the reasoning behind your choices.