'They would pay more if not a resident or they would have it in the name of a resident or company I presume'
untrue,
they get a 50% discount on cgt,
but i suspect many are not even paying that!
http://www.ato.gov.au/General/Capital-gains-tax/In-detail/Calculating-a-capital-gain-or-loss/CGT-discount-for-foreign-resident-individuals/
imo, the ato are not in a position to police such!
