Microsoft online business loss of $726 Million really shows they are artificially keeping advertisement rates low, I think within one year things can change rapidly, Once they start increasing their advertisement rates, we all will be make more money than ever before, We can still break 2006 or 2003 record earnings of adsense.
May be they are doing this to slow down Google's growth, Which is a big threat to their business model.
They are not stepping their legs on accelerator immediately because if they increase advertisement rates, Google is a major beneficiary, So they want to damage Google's market share then step on the legs on accelerator.
My advice don't sell your site or stop working on your site in this panda panic, game is still on, You may see earnings in coming future too high to believe.