I don't see any issue with Turner getting those buffalo. Now I'm not overly educated on this exact situation, but from the sounds of it, he's put a lot of money and time into perpetuating the species, and he just gets crap for it. If more millionaires took practical action like he has, a great deal more good work would actually get done.
But for some reason people seem to prefer it when the rich and powerful simply pour money into organizations that spend most of it on their own advertising (i.e PETA), or when they do the talkshow rounds raising "awareness" and acting like they are solving the problem simply by talking about it.
I give far more credit to Turner for actually DOING something practical to preserve the species even if he is profiting from it. If more of the worlds rich and powerful took an interest in this kind of thing, a lot of good would come of it. Who cares if they profit from it? People tend to get so cynical when somebody else is making money while doing a good thing. I see it as a win-win.