En-Rooter,
So, say at Wagga, you guys give traffic on IFRs into and out of the aerodrome and all VFRs (that you can see on radar).
It follows that the only parts of the traffic jigsaw missing are the VFRs at low level, i.e. more or less the circuit area ... which is the bit that the Unicoms aren't allowed to see.... where's the value?