You talk as if you, or any of us, are paying a fair price to use the park Cruze. If you wanted the marginal cost of your usage covered then you'd be paying a fee to a private company to enter their park. Just extrapolate from the Summerday Valley ourcome and you'll appreciate what I'm talking about.
I'm sure they (PV) went to great lengths to inform themselves about possible positions which were open to to them (regarding to area closures). I can only assume that the closures of the Rosea area (and others) have been undertaken because of the legal risk which the PV would have to wear should they 'open the gates'. Why would they take the risk???
I think you do know about tracks... It seems to me that a number of chockstoners are prepared to take the risk themselves. I know I would (I'm going climbing in the gramps this weekend and would love to visit Rosea but I don't want to be the guy that fruges it for everyone, who knows, they might ban us if we stuff around here).
As for volunteering; I don't think it should be necessary, which is why I've recently been in contact with my local member about funding for our national parks... we pay those guys for a reason too...