what u said is right but importance and priority also plays an important role in deciding the availibility...
As u see awadh,pushpak,taptiganga etc run regularly but u cannot find any seats in it..
And Pnbe Mtj also runs daily nd it is one nd only which provides connectivity to stations wit mtj but still it run vacent as u will se its full 4rm lko coz lko mtj quota is short so less seats but if u take WL tckt also then it will get clear