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But I tried it and the ads are very relavant. Simply from the name of the subdirectory on my host that contains the website, Adsense is putting the exact type of ads I hoped they would.
I also put some relavent words in the page <title>, and added some captions to the pictures, but Adsense was targeting my pages perfectly without these additional steps.
I still haven't got a single click after about 100 page impressions, so maybe there's other reasons for image sites to not do well. Maybe after the page gets discovered by the search engines it will do well.
I have a section of my site that is devoted to images and earns a bit... but not a great amount. The CTR for this section is very low... never more than a percent or two even though the ads are fairly well targeted (I assume... what is the viewer actually interested in?).
I typically see about 1500-2000 impressions a day in this section, which earns a few dollars. I don't think that images are generally very high converters so to earn anything serious... you need quite a lot of clicks.
Believe it or not I have found adlinks work much better on image pages than the normal ad blocks. Only exception is when the adblocks have an image.
I think most people searching for images don't spend much time reading text, which is why the adlinks work better then a full blown ad.
I have often visited image sites. And I can't remember having clicked on any "text ads" or "text banners" before when I'm at these sites. However, I have clicked on "image ads".
When I'm at these sites, my number 1 purpose is to look at or find images. So my eyes will first scan and look at all the images that I can see on my monitor screen. Most of the time I just ignore the "text ads"