Glories of the 80s doesn't help but probably higher expectations from being one of the 'City clubs' as well. Their fan base outstrips the rest. Really, Celtic, Rangers, Aberdeen, Dun Utd, Hearts, and Hibs should be the ones making up the top six without doubt. However, at least one of them has a gash season every year. Hearts this year....so far.
In fact wasn't last year the first time since the SPL formed that the top six was filled by the 'City clubs'?
If so even then Hibs just snuck it.