West Coast in Perth is a unique situation, it far exceeds any other home free kick differential. I dont have the answer why, but it does.Well teams with the home crowd advantage do typically get the rub of the green from the umpires.
Look at West Coasts record in Perth.
Unfortunately umpires are human and there isn't much we can do about it.
The GF crowd is a lot more corporate neutral than any other finals crowd. You only need to look at the PF Richmond vs GWS, and the GF Richmond vs GWS. Vastly different crowd breakdowns.
I'm not saying their isn't a crowd bias, but it's far less than other finals.
Do favourites generally get more FKs that underdogs? Are Victorian teams generally favourites against interstate sides?