Well in Soccer/American Football, the Finals of championships/tournaments is often pre-determined.The 34% represents the MCG home team supporter denial.
Of course it's an advantage. Tell a follower of any other sport in the world the fact that a higher-ranked interstate grand finalist has to play on their opponent's home ground.. They'll laugh at you, and rightly so.
Most week to week playoffs/finals though are either split Home/Away or played at the home team ground, but most of those sporting codes don't have teams host home games at multiple grounds so there's not really a VIC stadium equivalent.