I'll bite on the market research. My opinions/impressions:

Elephants: way too expensive in Namibia.

Lions: few and far between.

Leopards: reasonable success I hear, but have shot my first and last, so not of much interest to me.

Buffalo: I tried once, but the outfitter I talked to wasn't much interested in pursuing it as it was "remote" (the Strip) and was grossly expensive and few on license, even if he had.

I have never been there, so this is pure speculation on my part.