Many emu farmers mutilate their birds by cutting off a toe to avoid hide damage when the birds fight. Despite such desperate and barbaric methods, the industry is miniscule and doing poorly. Answer Meat chickens are killed at 7 weeks of age weighing about 2kg and eat 3.2kg of feed getting there. Consider also that you can't keep brushtailed possums by the 10s of thousands in large sheds. As youcan see, crispy fried possum just isn't going to flood the fast food market.
Some people claim that placing a commercial value on wildlife serves to protect it.
In passing we point out that in 1924 some 2 million koala furs were exported from Australia's eastern states. The pattern with wildlife hunting has always been the same. Hunting pressure soon exceeds population growthand various controls are introduced. Depending on the value of the animal, poaching may then continue and drive the population down further and require progressively more draconian measures. Answer Hunter gatherers typically need 10 to 100 times the land required by farmers.