Google Adsense is not working in Africa

Google Adsense the biggest ads network on the planet, which is also known as the "Google money making machine", seems to be a total failure in Africa[IMHO - anyway thats why its on my blog...].
Dont rush to comment yet, read on to get my points.
I have been running www.ubstudents.com and its having atleast 20 unique visitors per day, with such traffic in USA I guess I will be having atleast 2 USD per day, but here in Africa I get 0.1 USD on the average per day. I have also placed adsense on this blog http://mambenanje.blogpost.com, www.bushfalling.com and www.kupexsans.com , but the overall revenue from the four sites is barely 2USD per week on the average.

I have some small explanations for this though:

- Adworks is not yet used by most African firms, so most adverts that get served to adsense publishers in Africa are mostly for international viewers which is not higly targeted for our African audience and it results to low click through rates.

- A friend of mine who owns www.webmastersofafrica.com gave his own explanation as follows: African publishers are abusing the adsense program thinking its free money and thus Google has put high restrictions to the African part of the Adsense/Adworks network.

If there is any person out there with an African venture that makes a great deal from Adsense, please place a comment so I could know if its me or its Adsense not getting it right in Africa.

For example, a big website as www.nairaland.com with 200,000 registered members and an estimated daily traffic of about 50,000 unique visitors, I guess the 25 year old owner of the site would be making about 1 million USD per annum but I bet he barely makes 500K USD per annum which can clearly justify my claim that "Google adsense is not working in Africa".

I personally think African web publishers need their own ads network which will be highly targeted to advertising African products so that the African users of our sites will get to see adverts that make more sense to them. This will lead back to my open source Adverts solutions for publishers (code named admark), which I talked about in a previous post below.