You're well-informed about music, fair minded and you seem to be an objective observer. Can you tell us what you've learned in here?
I've learned that CM listeners care very much about the aesthetic tastes (likes and dislikes) of others. It's somehow relevant in evaluations, but I'm not clear on why. Naturally we want to belong, we want to save time by hearing recommendations , we want to follow the trends perhaps.
I remember being surprised that I could predict weekly changes in the ranking of songs in the top 20 on the radio in the 60s and 70s. Of course I could have been fooling myself, but it was fun and seemed doable. So, in the aggregate, statistically, there's something to this popularity thing..