That is assuming one always wants to be in the CBD. =p E.g. once a week I go to Marsfield (near Epping) for uni work, so Meadowbank is better. Karate dojo is in Hornsby to, so I'm basically in the middle.
Also it's cheaper here and I'm still just a student even if I am being paid something. =(
Alas, no trading feature yet! Maybe one day, but I'd hope you find one yourself by then. And first the servers would have to work. :V