The value of Bad. Knowing what you don't want, is as valuable as knowing what you do.
In the flower days of the 60s and into the 80s there were thoughts of everyone and everything being good and personal best. Most know that there are good and bad people, and no one wants a surgeon that got through school on personal best. Basically in knowing what I do not want, helps me not waste time and I can focus on what I do want.....and this should not be a surprise to anyone on AudiogoN, it is very much what the pursuit of the absolute sound/the high end is about.
If you are not sure about this, go to ebay and type "audiophile" in the search bar and look through the listings.