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[edited by: scottb at 10:43 am (utc) on May 20, 2014]
Sometimes I wonder that the ones who are not affected are low earners who don't have a big data to compare.
There is an irony in suggesting and advising more investment of time in improving a website, adding content, etc for an apparent and "out of my hands" source of customers (people who click) which is paying less than ever.
FYI, only the most sophisticated Adwords advertisers decide where their ads appear.
The largest one and one of the smallest both plunged around March as yours did. They are in two completely different categories, more than seven years old, have strong Adsense scorecards, strong authority, etc. Nothing changed about either site. They just dropped.
Network Revenues - Our partner sites generated revenues of $3.40 billion, or 22% of total revenues, in the first quarter of 2014. This represents a 4% increase over first quarter of 2013 network revenues of $3.26 billion.
There aren't any tiers in Google Adsense and Google isn't stealing your money. What is really happening that most people pay no attention to is:
1) The shift from desktop to mobile devices, if your site isn't mobile friendly you'll lose TONS of revenue from this.
It's not a partnership if one "partner" controls the game while the other "partners" spread chicken entrails around in an attempt to divine an answer.
Looks like Netmeg is the only one not affected.
Perhaps it's even part in parcel to Google not having the ad units or system in place for us to use.