Unfortunately, I think you don't grasp the situation fully.
The Feral goats are everywhere not just Gnaraloo or Quobba but are also much further North and south and go as afar inland as Meekathara (if not further), I know about Meeka as my brother lives out there and shoots them for his dog's food.
Unfortunately a 5 line barbed wire fence is not enough to keep them out as they are clever sneaky beggars, fencing which can keep them out is not a viable option on any farm or station.
The trucks you saw at Gnaraloo were part of the Feral goat removal programme being run at the station, and yes they sell them so as to re-coop some of the costs of having to muster them, if you had have also done a bit more research you would have found that they also get some assistance from the government to assist with the cost of the removal.
Mustering goats on a property the size of the Gnaraloo is not a simple task and would involve quite a few people and vehicles
With a bit more research you would also find that as well as reducing feral goat numbers they are also reducing sheep numbers out there.
Now I can't talk for the rest of the crew who have been slipping the slipper in after your rants, but knowing the majority of them I would say they would have checked a fair bit of this out before hand.
It was also very obvious that you have your nose out of joint with the management of the Gnaraloo station which most likely as a result of the Wetsuit indecent which you posted as the real trigger for your animosity and trying to drag them through them mud. It wouldn't be surprising to find that you were one of the people who had his wetsuit removed.
A simple search found that there is no vehicle access to the beaches at the Gnaraloo station, even if the "GUN surfers" are trying to avoid the Gnaralooser crowd.
Another simple search found that Gnaraloo station is quite involved in the turtle conservation programme for the region.
Caped crusader I don't think so

Pratt with a vendetta? more likely