It's one way to make the travel aspect fair though it would limit the meetup to those of us with the ability to travel, which wouldn't be as much fun.
I wouldn't have a problem with Melbourne or Sydney. I think the highest concentration of Australasian Playgrounders is Melbourne, but I know Sydney pretty well (I have family there). And considering we flew to Brisbane for the last one, it's clear we don't have much problem with travel. Though I have to say, Melbourne is a shorter trip...