Has this payout structure been conclusively documented? I mean specifically the part about obscure artists getting absolutely nothing.
I know a couple of relatively obscure bands personally, and they do get something from Spotify. It's not much, but they do get a little bit. They consider streaming more as advertising that gets their name out there and their music easily accessible, but they make most of the actual money from shows and merch.
E: Artists can see their playcount stats and payouts here: https://artists.spotify.com and as far as I know, even niche artists are paid the $0.006 per song, not just the biggest players.
E2: I am a huge fan of the Bandcamp model, though. Most of the time I find music there that isn't on Spotify, and I've also bought albums on there even though they're on Spotify as well, because I want to support the artists directly. I have completely stopped buying physical albums.