According to this page on the Qantas website,
Platinum, Gold and Silver Qantas Frequent Flyers and Qantas Club Members receive additional free checked baggage allowances:OH?
Domestic Australia, trans-Tasman and international routes (except for The Americans as listed below)
As long as you have reached Silver Frequent Flyer status, you are eligible to have 10kgs (22lb) free checked baggage allowance.
Isn't that cool?
Currently fees to join the Qantas Frequent Flyer are as follows:
Australian residents - A$82.50*
New Zealand residents - NZ$50
However, if you are applying from out of these countries, it is FREE!! Can you believe that?
Anyways, for the sad people of Australia, if you are a resident of Australia (which you are, and want to avoid paying 83.50AUD),
there is another option.
Join through Woolworths, and check out this link.