Upcoming changes to Spotify Free/Open | Doktor Spinn
And what about three premium levels? The top level could be super expensive and provide extensive Sonos support. Use PR to turn this level into a status symbol. Call it "Spotify Black" and change the green color. And then add Spotify Black which you only can unlock when your playlists are followed by more than 5,000 people. Once you reach this status, the interface text changes into gold against the black background. Personally, I would both pay and kill for that kind of status.
Source: www.doktorspinn.se