For me personally, listening to music I love is also at the same time struggling to hear that music as correctly reproduced as possible. One of the "tweaks" I experiment with, after e.g. a cable change, is polarity. The better and more natural the system sounds, the easier it is to hear correct polarity. Thus the repeating experiments.

I do not agree to whether 85% of CD's are of reversed polarity. More like the opposite, but the word is that sometimes single tracks on a cd has the wrong polarity. Although this might be true, I have never encountered this malady.

No doubt is correct polarity important though.

http://www.slicingupeyeballs.com/2010/06/30/xtc-skylarking-reissue-vinyl-corrected/

As far as Lp's go, I've only found a few rock discs, but I hear that classical would be a higher figure. 

Do classical lovers find that a lot of discs, LP or CD, are reversed-polarity?