@Mrs.Sippy (I like the pun, btw)
I could be mean and say "isn't it strange how many Africans follow an Arabic religion, yet Arabs help them so little when there's a famine or a disease outbreak to clear up (alledgedly only 5 million (£ equivalent) to fight Ebola, for example).
Or I could be more honest and say that only the USA (and Canada?) and Russia have the kind of grain surpluses (alleged to have been dumped at sea in past decades, to keep prices at the right level) needed to fix nation-sized food shortages, across the world. The last thing the Arabs would want (you'd be forgiven for thinking) is to be spending the money they'd earnt, by selling oil to the western world, on buying grain from those same countries and then giving it away to (mainly non-Arab) Africans.
Sidebar: why does anyone give away money or things to anyone who isn't closely related to them? For show? To ease feelings of guilt? To curry favour with a deity?
Back on topic: money spent on extravagance goes out to the manufacturer, its raw material providers and their workforces' wages feed it back into the local economy.
Provide food to a struggling population and they will respond by raising more children. Once started, you cannot stop assisting without triggering full-blown famine. Live Aid was a great and good thing but it was about fixing a one-off war-caused crisis and getting them strong enough to look after themselves again. I need to check the facts but I think it did morph into year-on-year aid (much of which falls into army/rebel hands but it's better than nothing).