Actually in Australia that may not actually be the case. It is very well established that "despite what is in a contract, there may be terms and conditions outside that agreement that the law imposes. For example, it's no use having a clause saying 'no refunds' when the law actually gives people a non-excludable right to a refund under certain circumstances".
And changes in Consumer and Fair Trading Laws treat many online purchases as subject to the laws of the purchaser's location rather than that of the seller i.e. if you buy it from an online site in Japan and your in Australia it is as if you bought it from an Australian based retailers.
Just some food for thought...