I don't know, I'd probably just give 50 millions to charity and hire a professional to counsel me on what to do with the rest

I mean, this is not really a solution. Poachers don't do what they do because they're greedy and hate animals, they do it because they're poor and have often no other choice but to risk their lives to make a living, and they are probably getting something like 10$ per rhino horn. This is a systematic problem perpetually reinforced by the actual people we should be shooting: the millionaires who hire the poachers. They are the ones destroying the environment, exploiting animals and people and reselling those same rhino horns for ridiculous amounts of money on the black market.