Further to heli-cal's comment and your response, it does not have anything to do with Nigeria's reputation (which admitedly is below dismal) but more to do with the reason why companies and governments provide sponsorship. Companies in France for example might sponsor a French citizen who may eventually use his skills in France. The same with governments.
PLease don't get me wrong since I applaud your interest in aviation, but I am not sure why a foreign company or foreign government agency would send money to a citizen of a country which is a major oil exporter so that he can get his pilot's license? I am certain there are also many deserving people in their own countries which would love to receive sponsorship to become pilots.