londrum - 2:02 pm on May 6, 2013 (gmt 0)
i wouldnt use image ads on their own, because i dont trust their targetting, but i have found that they work quite well side-by-side with text ads. if you put two big square blocks at the end of an article, the left one with image only, and the right one with text only, then you get the best of both worlds.
i think the big image ad draws a bit more attention to the text ads -- especially when its well targeted to what the text ads are about. so even if they dont get clicked very much, and their stats are rubbish, they are still doing you a service by helping out the text ads.