How dare you judge other cultures!
I imagine the meat sells to people who come from places where chimpanzees live naturally. That or Asians. In any case, I imagine it makes you more virile, or at least that;s their take on it.
A buddy of mine in Asia works on stopping "exotic" meat sales (and other parts), invariably used as a folk remedy in place of what would actually work for them, Viagra (in asia it might also make them "big like snake," a pitch probably not needed in Africa).