The problem for Canberra is the lack of a true rival. There is not one "big" game each year they can count on. Sure sometimes they are boosted by big traveling support from Souths, Saints, Dogs....but it's not a rivalry.
Given the curse, the proximity of South Coast, and large number of Dragons fans in CBR, it would have made sense to turn it in to an event. But most games seem to be Monday night...and we don't even play them at all in CBR this year.
There needs to be an event / rival game for the raiders. Get 20k plus to one game, get a few more games to be 13-14k instead of 10-11k and suddenly your average is up 30%