EA made over 4 billion dollars last financial year, 84% of which comes from console games and only 10% comes from pc games
I was going to say that's more due to the fact that EA makes bad games which contards fork out their cash for, while PC gamers are more discerning and don't play bad games; but the reality is: that 80% of revenue from consoles is split between Xbox 360, PS3, Wii, PS2, PSP, Nintendo DS and mobile phone games. So the 10% isn't so insignificant (it's actually pretty even with Xbox revenues if you look at their financial reports).
In any case there's no reason to charge up to a 50% premium for a digital product that costs nothing more to sell in Australia than it does in US/UK. Apart from corporate greed of course.
Lately I've been buying all my games from greenmangaming or game.co.uk because fuck paying the australia tax; recent example was Dark Souls, $70USD on Steam but $45USD from greenmangaming. Exact same game. Literally no possible way they can justify their price gouging.
If they want to stop people buying games from other regions, they should address the problem and get rid of the price disparity; then there will be no reason for people to do it.