Most of the western district NSW is 10-18" annual rainfall, goats are feral but are viewed more as unmanaged livestock than true ferals. 30 years since I have worked in the western district. The place I was on was just under 200,000 acres and ran around 8,000 sheep. Even back then the goats were seen as a valuable resource and about 1000 a year would be mustered and sold. In todays money that would be $50-100k. They say more goat meat is eaten world wide that anything else, makes sense when you consider goats thrive in just about any climate.
Roo is a very lean meat, the major reason I think it has never taken off for human consumption is briefly touched on in the article.
The current system allocates a certain harvest number annually, shooters are paid on weight with no grading system so the animals taken are the biggest and heaviest. They are also the worst eating, no different to eating a 12 year old bull and comparing it to a bit of veal.
If they introduced a grading system for roo meat and payed a premium for the younger better eating animals they might be able to build a real market for human consumption. It would also leave a far better population balance and healthier roo population.
Trouble is there seems to real opposition from within those responsible for managing our native wildlife to anyone gaining any sort of financial benefit from them. Millions of roos are shot annually with cull tags but they are left to rot. I get about 50 tags annually for 200 acres and am not even allowed to take any meat for the farm dogs. The whole roo is just left to rot in the paddock.