DHL have pretty much got Africa covered, tough market to break into, youve really gotta have bucketloads of contacts high up in every imaginable dept, from DCA's to presidents..................It would be a very wealthy/brave company that makes that move. Having said all that, Africa, well parts of it anyway, can only improve economically, and competition is needed. DHL is very very very expensive.
Good luck, the flying, at least is awesome.