My generation didn't buy CDs. It was all mp3. I think the shift was when I reached CD buying age at 14.

I tried to compare the sub fee with how many CDs you would end up with.

Judging by my parents and friends parents about 40-80 CDs seemed like a common size of the music collection among people that had a collection, that propably had been growing for 20 years since mid 80s.

I also argue that video rental stores were way more value than todays streaming subscription.