could it be that you've recently got lots of public service ads? i believe they add to your clickthrough rate but not towards revenue...
Ok, I thought I was back in Aesthetics class in college... Everything from Aesop to Tolstoy... I hated it.. Why on earth they put an art student through this crap, I don't know. Eubonics, Pig Latin, baby talk, even a bit of "women speak" (my wife tells me I'm making progress), I can deal with... Not this.