When AdSense suggested I enable image ads to improve income a few months ago I did, and got a small boost.
However, after the holidays, I've noticed wildly off target ads, mostly in my skyscraper unit, from everything from Tivo to Vegas hotels.
No rhyme or reason to the ads, not nearly enough blocking options (50?) in "Allow & Block Ads > General categories" to control the situations. I only need on general category really, "Hobbies & Leisure", which pays over 80% of the site earnings. Unfortunately, all the other crud which isn't earning is too much to disable in that stupid interface.
Therefore, I shut the image ads off AGAIN this morning since the text ads still appear to be on topic and earning well.
It will be obvious in 2 days, maybe even by the end of the day, if this has solved the problem.
I'm considering opening the site back up to image ads again, but I'll do it on an individual ad unit basis and probably not allow the skyscraper to ever display images again.