Wow, I've never seen such a heated discussion about tax.
Frank, you are banging your head against the wall - the desire to avoid paying taxes is too ingrained to be changed by appeals to morality. It's in a similar camp to speeding or 'minor' traffic offences - most people just don't see it as a crime (or a problem).
BTW, what is the 'form to email' facility that you mention?
I pay my fair share of tax (in my mind, more than my fair share, but that's another whinge).
Actually you could be charged GST and fined for not declaring the items if they exceeded your duty free limit
lannes, do you happen to know if returnees (to Australia) with items of higher value than the GST-free limit are charged GST on the whole value or the overlimit amount?
Oh, and OP, Australia is definitely not the cheapest place to buy Canon lenses.