I don't know how many of you have tested out... I just found out that smaller size AD tend to pay better... I was averaging fairly good when I was using 125X125 and then I switched to 250x250 thinking it might catch more eyeballs... but my average click dropped to 1/10 ... I couldn't figure out what was the reason and today, I switched back to 125X125 and earning back up again. So I was wondering, does AD size matter? In my case, it does. And it matters alot. (I didn't change anything else) Anyone else has experience the same thing?
The success of an ad depends on a lot of variables. It may be that the design of your site is more conducive to a smaller ad in that particular spot.
From my experience, yes size matters. But exactly the opposite way. I get much more clicks from bigger ads.