I used to play the Age 9 letter puzzle every day, and once in a while when I couldn't get the word and couldn't wait 24 hours, used a 9 letter puzzle solver. One day I noticed Chi amongst the results, and I became addicted.
As to why Australia rates so highly, I think we may have a puzzle culture. My 92 y.o. mother-in-law does 3 crosswords each day. My wife has started doing the Age puzzle since I no longer take the paper for ages while I do it. So now I do it in Chi "Your puzzles" because it is so much better than on paper.
As to visitors by country, I don't understand it. I have a tracker
http://www.revolvermaps.com/ on 3 of my websites and Brazil comes up second, after the state of Victoria. There is no reason for a Brazilian to visit U3A Box Hill, Friends of Herring Island, or Burke Rd. billabong reserve websites, but they are from all over Brazil.
And I agree that Alan is a genius, a real one, not a Trump style genius.