At the end of the day CP's are a business and are there to make money. And as stated in another post, the more attractions the more mula you fork out. There has been an increase in CP usage and there has been a bit of a revolution here, with resort prices going through the roof many younger families and buying vans, CT's or family sized tents and heading for the big parks like Big 4's (why I don't know), but they have attractions for the kiddies, parents can sit back and sip their wines whilst the kids are of off being entertained, rather than being a part of the kids entertainment.
Regnshaniah, may I suggest looking for council funded CP's in the area you plan to stay, they are basic but clean and usually well looked after. PLUS they are a lot cheaper than your more eloborate parks. I know the one north of here at Maira cost us $21 p/n unpowered & 23 p/n powered, that's for 2 adults & 3 kids, and there are weekly discounts, plus discounts for pensioners. It's pretty good there they have a play area for the kids, bbq area and its right on the banks of the Kolan River. It suits us for a weekend away when we don't want to go bush and it is extremely popular with the grey nomads. But there are many around like it. We stayed in one at Wingham at the showgrounds $18 p/n or $85 p/w powered. Most of these allow you to dump your loo or cassettes as long as disinfectant is used and not the enviro stuff.
In all honesty I don't think this is a business that you could regulate, it is a bit like holiday units, location, location, location. Prices are controlled by where the parks are and the ammenities they have. You wouldn't expect to pay the same for a 5 star resort unit on the beach with all the trimings as you would for a back water motel room, would you, no matter how old you were.
Life can throw nothing at you that beer won't fix