I've just updated my ads placement, what do you think? three 300x250 at the top on index. one 728x90 and one 300x250 in post pages. Let me know if you think you have a better idea for my sites. Thanks! http://www.mytubedesign.com
It's been two days and the revenue has increased a little bit. I will keep observing and see what else I can improve.
I would change them to text ads. Text ads, usually, are more profitable. They appeal to a greater amount of people as they offer a variety products and services. A banner ad offers just one thing at a time. Less efficient in my opinion.