Both the hunting preserve and safari protected area are managed like zoos...both areas attracting large dollars for a poor nation. This activity actually helps to preserve the species and improve the economy of the region. A failing economy would mean the end of all these creatures that Americans seem to worship as the locals would be unable to protect and manage the areas and the poor would kill everything.
Also, large mammal natural selection in most parts of Africa has been extinct for sometime now. We determine the correct numbers of predator and pray and where they should live.