You only have to be in any caravan park and see the $120/150 000 new or near new vans that are towed by a $100 000 tow vehicle....these people aren't worried by 60/70$ powered site.
Reality is, there are thousands of GN and there is a certain % that can afford those rates. Also, if you go off peak or regional areas, you will pay $35 a night.
Not everyone is a "rich grey nomad" and not everyone is a "poor nomad". But there are options in the caravan market to suit all comers.
We probably sit in the middle of the road so to speak however, we do enjoy bush camping versus van parks.
Some bush camps have million$$$$$ views that would equal many of the tourist areas' scenic views.
Jay&Dee