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Does anyone have a theory as to why we are all seeing such dramatic drops in CTR and revenue?Yes and none of them are pleasant. It might be that Adsense has integrated that behaviour based advertising to such an extent that it thinks people are on holidays (or weekend break) and therefore it won't serve well targeted ads to sites that have a working week profile. As this is the traditional holiday season in Europe, every day seems like a holiday to them.
Yes and none of them are pleasant.
Does anyone have a theory as to why we are all seeing such dramatic drops in CTR and revenue?
They've a leaky bucket and haven't a clue how to repair it.
If it is in my power to change things, then I will, if it is some weird stuff Google has put in place, then there is nothing I can do and I will just have to find a new way to make up for that 25%.