It can be common sense, but ad-positioning is very important and can determine your future earnings. Your choice of placement is critical for your earnings.
I recently overhauled my ad placement on several websites and saw a notable change on one website that receives around 10,000 unique visitors a month. The earnings for this type of website are not so good on Adsense, but I saw a satisfactory increase in click through rate once I repositioned the Adsense just below one of the navigation bars.
My intention isn’t so that visitors mis-click on the adverts, but so the advert is more visible. It seems to have worked. Now the advert is in a more visible place in the middle of the page that is immediately visible on screen, the clicks came in higher than before.
Here’s a screenshot of yesterdays earnings. I’d say before I was on £5 (gbp) a day. Now it is over £10, that’s over double.

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