Scabscrath can be very useful. You can't have a normal vampire that scouts, causes terror and flies because hunter in the dark + flying horror costs 55pts, that's too much for a ordinary vamp. BUT! He could take scabscrath, Aura of dark majesty, talisman of the lycni. That would sum up a 9'' movement, magical attacks, terror causing (-1 to enemy Ld) vampire who costs 170pts. Very handy in a bigger game against for example skaven or the empire.
There's one banner I can't understand why would you take it instead of a Warbanner: Banner of the Endless Nightmare!! Haven't I noticed something awesome about it or is it just crap. I mean, if you take Warbanner, you get +1 combat resolution, but if you take The banner of the Endless nightmare, you must have 4 additional ranks and you mustn't be flanked (or reared), then you get the +1 combat resolution.
So what's with this banner?