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Two reasons, one is the increase in track (So Offset+Width plays a role), the other is that in Australia the wheel cannot protrude beyond the body work (So effectively no "poke" if you define that as beyond the bodywork).
The reasons are mechanical safety (increased track increases the risk of component failure), and Pedestrian safety (Poke increases the risk of pedestrian injury).
This is Australia so we'd rather prevent you from doing something stupid, than allow you to do it then sue somebody.
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