What these super high end cable manufacturers assume is that the cables used in the recording chain are perfect. Notice they don't market their cables as bringing you 100% accuracy to the recording, mastering and pressing losses as the "original musical event".
I have the audioquest wel speaker wire 8ft which is pretty much 3m. Retail is similar to above. Of course I paid a fraction of that. Compared to every other cable I have heard, I find it very competent at the price I paid. I doubt I will ever replace it