The Google giveth and The Google taketh away... Moral of the story: diversify your income stream as much as you can. I don't know much about advertising world, but it seems that AdSense is a bit of monopoly, and that sucks.

Random idea for a biz opportunity here: A service that insures content providers against AdSense account termination by routing all of the clicks through a filter to prevent "overeager" clicking by your fans, in exchange for a small fee. If your AdSense account is terminated, you'll be paid for it (just like if your car is totaled, your insurance company pays for it)