Not a lot of states are willing to put too much of their land outside of the economy (tax revenue).
As long as you concentrate the tourists mostly in one area so that the majority of the park is left alone by people, I don't see the problem.
...and subject it to... what? Capitalism is an economical system centred around private ownership of means of production and a market economy. There are other economical systems to choose from like (national and international) socialism, communism, feudalism and mercantilism. Would any of those do better than capitalism and if so, why? Socialism and communism have shown to fail miserably where it comes to protecting nature as can be witnessed from the devastation of nature in the former Soviet Union [1] and in Mao's China. Feudalism and mercantilism don't seem to offer much hope either. What, then?
I understand that it is popular to say that 'capitalism is bad' but I'd like to learn of the alternative which offers better outcomes.
Is it people delivering products and services, asking for whatever price the market is willing to give, such that they can make ends meet?
I'm from Romania and I've always been fascinated by privileged westerners complaining of capitalism, when capitalism is the entire reason for why you're privileged. That, plus the hard fact that our communists didn't give a shit about preserving nature or brown bears. Actually, our former dictator was going bear hunting, one if his favorite pass times, and wasn't satisfied without a killing spree with dozens of bears as victims. There are videos of it available. And nobody could do shit about it, because we had no rule of law. For the rule of law, you actually need capitalism, but many of you haven't lived the collective trauma that we did, so that kind of lesson tends to be lost in time.
Your communists sucked, for sure. But that was a personnel issue more than it was an ideological one.