The rebound of the vicuna is a weak example. For years, the animal was poached for its coat. Then, people found that one could shear the hair of the animal to produce a fine wool yarn. Wish that worked for every commercially exploited species.
You cannot garner pelts, skins, claws, et cetera without killing the host animal. Sure, you can extract bile from a bear's gall bladder without killing the animal, but the bear inevitably lives its life in horrific conditions as a harvested creature. Some believe that we could harvest elephant tusks and rhino horns from living creatures, but the viability and ethics of that are quite suspect.
Can we have a better example of a well-managed and sustainable wildlife trade success than the vicuna, Ms. González?
The economics are shaky as well. Professor Alejandro Nadal of the Centre of Economic Studies at El Colegio de Mexico told columnist Ian Michler in South Africa's Daily Maverick that legalizing markets as a solution to wildlife poaching "with the aid of pseudo-economic analysis should not happen without a serious debate. I am not anti-trade, I am just anti-nonsense."