People expect certain functions on a blog at a certain place on the blog. Usually the post are in the middle and then links on the right, here and there a ad. But what if you changed that, let the ad be in the middle, and the content on the side with maybe a feature article in the middle below the ad. That would change the normal habit of just clicking in the middle. But it will also increase your payout and you will make more money online because people will click where they expect content. Especially in South Africa where people are not that web savvy yet. Mess around with the theme and make the ads part of the content. That way people will actually click on it on purpose.