They're either good enough to warrant desiring them as a seperate track
e.g. HOTS // A crack up at the race - The Music // The walls get smaller
Or shit, enough to warrant not having them at all. i.e whatever the hell that is after 14 minutes of silence at the end of Myths Of The Near Future.
Either way no-one sits in silent anticipation for 18 minutes after an albums finished, and no-one wants such unnecessarily huge file sizes, bah