They've released unreleased tracks on previous CD's, such as 2.0, 4.0 and 6.0, so I don't see how you say they aren't 'obligated' to release anything but live tracks.
But we never asked for those unreleased tracks, they just decided to do it on their own, for us, the fans.I just don't see the point in telling the band WHAT to do with their material.