Once more: the affected countries are not exclusively inhabited by "average" people. The majority are indeed dirt poor. There are, however, wealthy people in each affected country.
When things get bad, or if a wealthy person feels he has been exposed, the wealthy WILL use all the money they have in order to get out of there and to the West.
And if the front door is shut to them, then they WILL try the back door.
The average people in those countries *are* the dirt-poor. I most certainly am not comparing them to the average American.
As for a wealthy African developing Ebola and wanting to travel to the West to get treatment--I don't think that's much of an issue. Someone openly seeking treatment in a Western country isn't the issue--they'd be seeking transfer from one health facility to another--someone who might be infected and is not quarantined, thereby exposing caregivers in the community, is the main concern.