I suspect that they make their money on the beer, concessions and shirt sales from the guys in the cheap seats.
When I was looking at seasons in the reds, I decided that there would be no beer at the game, no shirts, no bags of peanuts, no pulled pork butties, etc.
Now that I have seasons tickets in 127, there will be a beer or more per game, new shirt, the occasional bite to eat (I seriously love the pulled pork), etc.
So, I'm not sure that they make 4 or 5 times as much from supporters as they do from the prawn sandwich crowd.