Number crunching: aid versus tax

As a reminder of something we've noted before, from our quotations page:

Up to now, support for revenue and customs sectors has attracted a minimal share of aid, of around 0.1% of official development assistance annually.
Jeffrey Owens , head of tax at the OECD, 2010

And now look at this:

If Africa were a single country, collected taxes represent more than ten times the amount of aid the region receives.
African Economic Outlook, 2010, 60 second guide.

A case of misplaced priorities, perhaps? And here is a related question.