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But what if the reverse happens? all of a sudden, my CPM has shot up by some 200-400% . And I have no idea why, there are no new sections of any spikes in my visitors. Almost everything is the same, but for one week now, my CPM is averaging close to $3.00, when it was always at around $0.85 for over 1 year.
I am not complaining and I hope I don't jinx it.
As for earning spikes, given the little data we have on how the system works, it can be explained as either site targeting by advertisers or a click/earnings dump.
By the way, is your CPM increase due to CTR improvement, an EPC improvement, or some of both?
They say the age of your site counts towards your eCPM.
I've never heard that before.
My eight year old site doesn't seem to support that idea either. Maybe it's just my site.... it lives in the land of the five and dime click with eCPM to match.
I have a 5 year old site, great traffic, google regularly message me with ways to improve my site, I use only white hat SEO, the site does incredibly well in Google SERPS. Yet the site gets smart priced to death.
Yet I own another site, on the same subject and it earns 5x the CPC. It's insane. Nobody ever knows why when I ask them. The sites otherwise seem to perform identically, similar CTR etc. Just for some reason Google decides that my main site, gets smart priced to hell.