There was a media survey a few years back that discussed the high price in games, DVDs and the like here.
Yes, Australian Wii games usually cost $80 AUD on release, sometimes $90 or even $100 if it's a big-name or anticipated title. Same goes for 360 or PS3 games, though they often sell for upwards of $130, especially if the game has more than one disc. They claim it's for localization procedures, import, translating to other PAL languages like German and French, however in the exposé it was stated that they only charge so much because they can get away with it. Consumers don't protest, or boycott, or kick up any kind of fuss over the price, they just continue to buy in mass quantities, so the publishers charge what they like.