Being a newbie, I can't figure this out. I have a set up a campaign with text ads and image ads. Image ad in 200x200 animated gif and scryscraper format. Text ad is shown thousands of times. Image ad in total 8 times. I have set auto bidding for image ad. Quality score is 9/10 for about every keyword for the image ad (using roughly the same keywords as for the text ads). Still no impressions. Why, oh why?
It's up to the individual webmasters whether they want to show image ads or not. Some adsense publishers don't like them because they take up the space of several text ads, and don't pay anymore than a text ad. Some like the look of them on their site, and know how to get clicks from them. Run a placement report and have a look at where your ads are showing - block the text ads that aren't performing for you - add placements if you have particular sites in mind that show image ads. And head over to the adsense sub-forum and ask adsense publishers in what situations they get clicks on image ads, and what formats they like.