Wow! That is very interesting.
In the US there are pretty comprehensive "pest-control" measures taken in urban apartment complexes to ensure that there are absolutely no insects, spiders or geckos indoors. I probably see a really tiny "house spider" (which is probably a centimeter across in size) once or twice a year inside my apartment.
So my question is it common to not have pest control in OZ or is your house the exception (since you are nature lover maybe)?