Regarding Wikimedia chapters, I wrote:
I have no plans for encouraging the formation of one anywhere near me, unless I see solid evidence that it makes financial sense.
I'll just add to that that I did a quick review of the tax situation with charities in Australia. It seems a Wikimedia chapter in Australia may qualify as a charity but would not qualify as a "deductible gift recipient" (DGR). This means that although it would be exempt from paying income tax, donations would not be tax-deductible. So there would be very little financial benefit in creating an Australian chapter.
Approved DGR categories: http://tinyurl.com/9kz9q
-- Tim Starling