ember - 11:26 pm on Dec 6, 2011 (gmt 0)
Re: changing from text to image/text ads, we initially saw a drop off in revenue, too. Higher epc but lower ctr for overall less money. But I'd heard from several Adsense people who said stick with it, that the more advertisers competing for the space, the higher the price would go. It took a couple of weeks, but the image ads started targeting better, and so the ctr rose. Combined with the higher epc, revenue has increased about 15% with no increase in traffic. So it works, but it can be hard to watch earnings drop before they increase.