Google Relevancy

Heres a quote ...

"A Quality Score is determined by the historical keyword performance among all advertisers, as well as the performance of an ad from an individual advertiser performance across a set of specific terms, and the relevance of the "creative" or ad text. Kamangar said there are also other factors in determining the score which he declined to disclose."

I'm wondering right now, given the past two days of keyword anguish brought on by Google's changes, ... what exactly are the non-disclosed factors.

I wouldn't mind betting that .... "he's not paying us enough ... so lets disable his keyword so he'll pay more to get it back" was a huge factor in this decision to make the changes. Could it be that Wall Street had a word in Google's ear given thier share price to earnings ratio must be huge.