Wow, those numbers are quite telling.
If you consider that paying for Spotify premium is basically the equivalent of buying one album per month, and the top 12 artists I might be listening to are getting nowhere near 3,500 streams per month from me, it would be better for the artists if I used free Spotify for discovery (like the radio) and then used the money to purchase those favorite albums/songs (that I could then own).
Great food for thought.