I'm honestly not surprised by the article. For two reasons..
1. The ATARs (or a little earlier ENTER scores) to get into some teaching courses is waaaayyyy too low. I guess that fits with the saying mentioned earlier of "those who can't do, teach". So it's easy to be a crap teacher and not burnout because you don't give a stuff about your students because unfortunately, there are some people who become teachers purely because they can get into it, which I think is crazy. There are some girls in my year level aiming for primary teaching at the end of next year and I know they'd be terrible teachers. If I were a parent and they were going to be teaching my kid, I wouldn't be impressed.
2. There is so much behind the scenes work that goes unnoticed. All the meetings, emails, phone calls, work over the term break, planning outside of class, attendance at school events like speech nights and information nights. No wonder teachers are burning out.
3. I honestly think that teaching in a low SES school would be incredibly frustrating as some, NOT ALL, kids wouldn't even care about the work. I recently got back from a school trip to central Australia and I saw this first hand. The teachers (well the good ones), care so much about the kids, and the kids just show them barely any respect at all. Also, I asked one of the teachers from my school who came away with us on the trip which school she has liked teaching at the most, and she said mine. I'm not trying to sound like a snob, but I think being in a higher SES area the students may be more motivated, which would in turn make the teachers more motivated to do their job well. That's not to say there are some terrible teachers in private schools, or schools in higher SES areas.