The main reason as to why vintage stuff is worth more here is because its harder to find. While Apple practically OWNED the Australian education market from the mid 1980's up until around the late 1990's, outside of the education, publishing and design industries, Macs were never really all that common, mostly because not only did they used to cost an absolute bomb back in the day, but also because up until around the time Apple Stores started opening up, Apple customer service here was....well....terrible. And the fact that most resellers couldn't have cared less didn't help much either.
Either way, what a journey...great to finally see the pics. And I agree - its about time that something like this happened here in Australia. If I were a little bit closer, and I wasn't in the process of looking for another job (and therefore had money), I'd be heading down there myself to grab a carload.