Results not typical said:
It's a complex problem. A country with 23 million people at the bottom of the world now has the ability to shop directly from a low wage country with 300 million people that has much more buying power and where you can avoid local taxes. Can't blame people for taking the lower price. I would too for a margin that large. I guess that the eventual consequence is that so many businesses will close and lay off staff in Australia that a lot of people won't even be able to afford the USA price. You can't shop for cheap stuff on the web when you have no job.
Just to help clarify for you, the middle men don't actually do anything to improve our (ie Australia's) ability to pay for things. Instead they simply provide a service to other Australians that means that some of the flow of goods coming from overseas gets distributed to them as well.
The easiest way to think about this is to remember that if there's, say, a $100 item sold at retail domestically that can be purchased direct from overseas for, say $20, the other $80 is simply Australian-to-Australian bartering. All else equal, under both cases we are obtaining $20 of stuff from overseas and that is being paid irrespective of the middlemen within Australia. Instead of standing around retail stores all day to trade with other Australians to obtain a portion of the total flow of stuff, they could instead shine people's shoes, make gourmet dinners, clean up gardens etc etc. Our ability to pay for the foreign merchandise is (essentially) not affected by the "middlemen", it is affected by our exports and net wealth transfers from overseas.