I suggest you bring your ideas to Africa and see what they say about depopulating their own countries for the good of their wildlife. Maybe they can turn the excess humans in soylent green, tho Im betting they will tell you to rid your own excess populations and leave them to manage their own wildlife. Cheetahs are a renewable resource. Just like that hamburger you ate for lunch. I think legal sport hunting is preferable to species extinction in the wild.
The "kill the humans to make room for the animals" crowd always seem to find reason to exclude themselves from sacrafice. But even some of them have woken to the fact they have made a stupid mistake with the cheetah. The residents of Africa are not to fond of the Western Walt Disney crowd.
Well there you go again, with your black-white thinking and false logical reasoning. You're approaching this from the standpoint of a proud & righteously indignant hunter, which seems to be what your mission is all about. That's a useful and insightful perspective but rather limited and subjective.
In my opinion you do not need to 'manage' nature, or place a dollar value on it or make it a sustainable resource. Those terms only apply when you involve modern humans, with their abstract economy. You propose replacing a system with perfect inherent balance with one that has none, one that will favour one 'product' above another for irrational reasons & motivations, one that will invite marketing and investment. A business approach is a contrived human dogmatic system and it is not self-balancing.
What does need managing is the human race, and this does not imply making people into Solyent Green or depopulating areas but it does imply change, change over the long term and an international approach, not one based on financial trade between economically mismatched cultures.
As Ink says with power comes responsibility. True nature preserves will come eventually.
You've used your 'hamburger you ate for lunch' argument several times now. I know you are doing this to dismiss criticism about your activities by implying hypocrisy, however it does conveniently side step the issue that the human population is now at such a size that it would be impossible to feed it without food production employing an industrial approach. We already know the size of population which can be sustained with traditional hunter-gatherer methods and it just isn't this big. On the one hand you imply you know you have been privileged to go on some of your hunting expeditions and on the other you criticise those who are not, and eat processed food.
So I suggest you stop scoffing at this 'crowd' or that 'crowd' and placing yourself in some noble club, the members of which are the only ones who really
understand 
.
Ive seen that before pretty crazy 
Yes. Fascinating. It's the influencing their behaviour part which boggles my mind. Human Cordyceps anyone?
I seriously don't think this earth has 250 years left, I should say the people of the earth, I think its less then a hundred...maybe 150
the closer we get to the end the quicker and worse its gonna get...
I know once they abolish green cash money I will completely separate myself from this world, I do believe that is gonna happen in my life time.

I suggested 250 years before social and cultural awareness catches up with the effects of the Industrial Revolution.
I'd put the figure for what you are talking about around 60 years tops. This used to make me very miserable, however I know believe it is an inevitable stage in human development and ultimately a good thing for the human race. A wasteful, tragic, ugly, ignoble, savage and pathetic stage, but there it is.