Msg#: 4278836 posted 8:52 pm on Mar 10, 2011 (gmt 0)
A/B split testing is highly advised.
BTW, how did you get separate Ad Type statistics on each of the sites you have? My Ad Type reports show all of my sites combined together. I can't see how to get separate stats for each site.
Probably selected images only on the ad unit and setup a custom channel. I did that once, and in my field, I tend to make more with text and image ads enabled vs image ads only. I tested it for 2 months.
Msg#: 4278836 posted 9:22 pm on Mar 10, 2011 (gmt 0)
I did the same test above (only image ads) and ended up with very low earnings. Most of the ads appearing on my site are contextual as well, few are images and the images pay higher. I thought that by disabling the text ads I'm giving more opportunity for those higher paying image ads, but it didn't work. When I thought about it, it seems that the majority of the ads are contextual, and fewer are images. That's why few show when both image and text ads are bidding on the same block. That's why they earn more, because the text ads push up their bid. Removing the contextual ads leaves the image ads bidding against nothing. Since they are fewer than text they end up earning less - because there's not enough bidding.