CTR was 0.10%? ONE click for every 1035+ impressions
I've been experiencing a similar trend for the past three weeks, albeit not quite as drastic. Where previously, 1000 impressions would typically yield ~15 clicks, I am now getting only about five on average!
Despite March traffic running at 122% of normal (64% new - 36% returning) my CTR and resulting revenue is simply a laughable fraction of any period over the past seven years.
Some March (7th to 28th) CTR comparisons to other period averages:
33% of Jan/Feb 2013 28% of March 2012 32% of year 2012 37% of years 2006 thru 2012
It continues to be depressing and when I think that to compensate for the inexplicable 60% loss in CTR I'd need to up my impressions by another 50,000 per day... I just don't know where to begin.