I don't get the transient population bit. I've lived here all my life and never came across anyone that did this.
Whoever is winning generally gets the bigger crowds, though the Brumbies are more or a chardonnay set.
In my experience the FIFO crowd (most by car) tended to be politic related or Canberra based employees of multi nationals, out early Fri afternoon, back late Sunday or direct to work Monday. Maybe its gone, good for Canberra in the long run.