Won't change my behaviour...but it really depends what it is. If I can find what I want "locally" for around the same (taking GST into account) then that's a no-brainer.
As funny as it might sound, 10% is a pretty reasonable rate
back in the UK the tax rate (VAT) is 20%. If you buy from outside the EU then you're likely to incur both VAT and duty, which for astro equipment works out about 25%. Even then, there are cases where you still can't find what you want at a good price in the whole European free trade area
and end up ordering from the US and paying the 25% import and still manage to save money
just saying, it's not just a problem isolated to Australia...