Gold coast stadium? Gws stadium? The games in tasmania? geelongs stadium is far bigger then all of these. You didnt think this through at all.GMHBA is a cheat ground that no other team is used to due to both the dimensions and the wind getting in due to the low roofs (or whatever you call it) for the crowd. If every team played away games there vs Geelong they would lose almost every time as well due to these reasons. Every other teams home ground is actually a proper stadium.
ps. All clubs train on outside grounds every week.