Several reasons.

If they send too much to Africa, what is to be used at home?

Its Africa, no one really cares. Sad to say but true.
And bluntly, the disease is doing nothing that they don’t do themselves, just faster. Centuries of genocide, slavery, torture all make people numb to Africa.

With all respect to our resident Saffers, for most people, Africa could fall off the map and few would ever notice. Its a black hole, nothing good ever comes out of there, at least in the news.
Conflict, strife, disease, starvation, I wonder what the Kardashians are doing tonite.

Until the disease hits home, its just Africa.

Remember, TIA.