@Kental2: If Microsoft, Apple and Adobe were Australian companies that all practically all US customers had to buy for business reasons, and the US cost per product was 160% of what it cost in every other country, do you seriously think that Congress wouldn't demand that the heads of those companies come in and explain themselves?

Microsoft, Apple and Adobe combined are not small. If their products are 160% more expensive than the exact same product in other countries, then that makes it more expensive for small businesses in Australia to do business compared with if those businesses set up shop somewhere else.

Even if MS, Apple and Adobe are not doing anything illegal, if I was australian, I'd be demanding that the government take action to stop this behaviour.