So there aren't any schools in poor areas? The kids there also commute to posher places for school?

That sounds hard to believe to me, but I also can't believe teachers are the lowest-paid workers in the country. This can only make sense with a very broad definition of "can't afford" - Sydney has of course become a very expensive place to live but that's not only a problem for teachers.

Add to this that the study quoted was confined to New South Wales but the headline makes a claim about 90% of Australian teachers, and it's clear the article is lying to you.