Forum Moderators: martinibuster
Also, the ads seem to be custom designed for leaderboard size. Does AdSense offer design services?
Probably the only way to tell if they are worth running on your site is to monitor your stats for that channel where you see them showing up.
I don't think Google offers design services, however, the advertiser can choose to upload image ads for the various ad format sizes that the content network offers.
Image ads are not charged more per se, but they must perform better than the block of ads (5 for a leaderboard, I think) to show for the ad block. All this means is that effective CPM must be higher, whether through higher CTR or through higher bids from the advertiser (or perhaps a combination of both).
What this means for you, the AdSense publisher, is that you're getting more money to show the image ad than you would showing the text ads it replaced. So long as the ad is reputable (IMHO, not one of those seizure-inducing flash ads), you should be quite happy that the particular image ad is showing.
Hope this clears things up. :)