MrFlex2600 - 8:32 pm on May 2, 2011 (gmt 0)
There is absolutely no control over earnings.
This is the scariest part of of the whole make-money-with-adsense model.
The incoming traffic and earnings are completely at the mercy of G even if you have 100% unique content.
You can spend years developing your sites, start making good money with AdSense but you can lose it any time.