Now for my $0.02
It was brought up in a conversation the other night, that there is a difference between the AGP at Adelaide and Melbourne. In Adelaide, you used to get all sorts of things, like FF, F2, FHolden, STs, V8s etc etc. These days in Melbourne, it is more entertainment based. Things like Nascars, the Porsche Sueprcup, or Lamborghini Challenge, or the old styled sports car race.
The celebrity races scare me no end- a heap of inexperienced drivers out there going nuts...imagine the negative press if one of these 'stars' got hurt...
The on the other hand, the punters at the track probably love them, and it is a bit of a feature of the channel 9 coverage...