Many players do it, Im a North supporter but S.Thompson does it frequently, Cunners and even Spitter now n then as examples.
That sucks dude. It's hard to be a supporter when your own players are pulling this sort of shit. Ultimately the blame has to go to the umpires and the rules committee though. They spent years trying to tweak the rules to lessen the amount of head high contact but now they've got players deliberately using their heads as battering rams to win free kicks. AFL seriously needs to wake the **** up.