I've had many conversations over the years about how it is Perth's relative isolation that has given it such a healthy fan culture. Four conventions a year, as you say, and before that there was a time in the mid-to-late 1990s that we were supporting one convention alongside three well-attended university clubs, two Star Trek clubs with a combined attendance approaching 8-900 people, the only Doctor Who club in Australia to meet every month without fail from 1983 to 2007 (and counting), anime clubs at Curtin and Murdoch, Gamer's Guild, Grey Company, a Babylon 5 group, a general media SF club, two SF bookshops and about four comic shops.