I suspect that is about as accurate as saying playing at the same venue as Essendon earns them the same amount as Essendon. St Kilda wouldn't get, for instance, Collingwoods MCG deal just like they don't get Essendon's Docklands deal.
No its based on the deals that got with both Stadiums now.
The Stadium charges are not necessarily a reflection of the costs.
They charge as much as they possibly can get away with.
The competition is limited so supply vs demand favours demand.