You are completely wrong. Every single ISP in Australia does not allow servers on residential connections. Go read their T&Cs. That's what they have "business grade" ADSL for.
Now, whether they'll actually use that to kick you off their network is unlikely, but they CAN. And if you piss them off they probably will (having worked at several ISPs in the past I've seen it happen a couples times). Thing is, with limited upstream why would you even bother when a VPS can be found for cheaper than a residential connection.
By the way, you'll find that most of Australian ISPs actually use static IPs these days. TPG certainly does (my ISP).
Just because you've not "come across it" and haven't had it used against you doesn't mean that our ISPs don't have the ability to use it as a weapon against you if they want to.