Dibbern2, I don't have any answers as of yet, but I will spend some time most days, experimenting, tweaking and trying to figure things out. The trend is going downwards by the week. To show the magnitude this week, let's say I was making an average of $200 a day before (like prior to Feb). Now, I'd be making $60 a day. Something like that. Those aren't the actual numbers, but just as an example.
I DO think that Panda has changed the makeup of the visitors. It`s almost the only explanation that makes sense. Not only would that account for lower ctr, but also might affect PPC if google assesses the traffic as less valuable.
(Noticed today that people from India simply do not click my ads).
I'll continue to update here. I'm seeing strange adsense numbers. On one site, I'm getting more page views reported than I have before, with the adsense numbers about a third to half higher than other measures of page views I use.
Why? No idea. It's one of the sites that is still making money. I'm using a url channel for for this.
I'm blocking almost all placement ads. There's hundreds, and it's tedious, but about 99% have NO relation to my sites. My visitors are simply not going to click on ads for dating in Korea, written in Korean. Doesn't appear to be any way to stop all the already "approved" ads all at once, so I'll do a little each day.
Here is one tentative theory that has been weighing on me for years. My impression is that when I have used ad servers (openx and it's predecessores, DFP, etc), I experience revenue drops. I "think" that might be happening now, since I've been having more adsense ads served via DFP than before.
DFP allows all kinds of flexibility that, theoretically, should end up increasing revenues, by having geotargetting, capping, and all kinds of stuff, BUT if it is screwing up the contextual part of the thing, it`s worse than useless.
I`have finally settled on a way to integrate both DFP and regular adsense adcode. I`m removing adsense from the rotation and putting the code back into my pages. I`ll use DFP for other kinds of ads in adjacent spots where context isn`t relevant.
I have a sneaky suspicion that might be one of the sources of the problems.
Just to add insult to injury, we ARE seeing traffic drops this week, attributable to Panda, probably.
Oh, one more thing. Looked at the new reports in the new adsense interface, and again, not a thing jumps out. Most of our ads are contextual, and while there`s hundreds of `placed`ads, it doesn`t appear that they are showing.
Still a mystery, but now that I have nothing to lose anymore, I`s still curious.