Why is it that people and parties seem to be located in the top left and bottom right corners? Why not top right or bottom left?
DLP is another example of a party in the bottom-left. It's a religious conservative split from Labor, actually over the ALP's supposed acceptance of communism (at the time), but it was strongly aligned with religious interests and I believe that they are on the economic left.
These sorts of parties don't really fare particularly well, because working class people are quite happy with where the ALP is in terms of its progressiveness.
As for top-right, it's not terribly uncommon either. Even certain factions within the Liberal Party swing that way, but it's predominantly conservative these days. The Greens also have certain people within it who are right-wing economically (aka "blue greens") but they simply are not enough to drive the party rightwards economically. Again, most of its voter base, which is mostly with the party as a result of its social issues, are happy enough to continue voting for it despite being left of centre economically. There is possibly a gap there with fiscal centrism and social progressiveness.