My have fond a connection between bannishment and AdSense Rates

Here are the events that lead me to believe this:
I was making a certain amount a day from adsense on a page that contained hidden text.

All of the sudden one day last month, Google takes that page out of it's results. (I assumed from hte hidden text at that time)

I get lots of traffic outside of search engines, so my traffic wasn't really affected at all. BUT, my AdSense rates plummeted about 70%.

3 Days ago I remove the hidden text. (up until this point AdSense remains 70%ish crappy)

Yesterday morning I notice the page at hand is back in the serps. (I posted this in Google News forum). At the same time, AdSense revenue is WAY back up. The full-amount I was making before the banment.

What do you guys think? Fact or co-incidense?

A banned site or page probably factors into Smart Pricing. So, makes sense...

I've got a site that was completely de-indexed about a week or so ago. The traffic and adsense revenue are both down 60%. The page ecpm is still the same, though.