Google-whacked again

Aaaarrrrrrrggggghhhhh! The Google has demoted my PR3 paranormal blog to PR0, because I've monetized it. For some reason, this blog has escaped penalty. I think I used a term, in one of my posts on Strange Days, that the Google Bot looks for, when seeking out victims to demote. Time to remove those nasty words. Hopefully, I should then get my PR back at the next update. What gives Google the right to try to stop people monetizing their sites? I've a good mind to close my Adsense account and demand what they owe me.