There are two threads at Google AdSense Help discussions with AdSense publishers who are simply not happy with the earnings they have been reported to receive from their YouTube content.
Let me quote you some upset publishers:
My revenue is down more than 50%. There were people who were expecting to earn $200 in January and instead earned $80. I was expecting $1000-$2000 and earned a little over $80.
Received my report. 1/5th of my Content Host earning. Shame.
63. Wow. Just as we're writing about it, the amount posted. And it ain't pretty. I had $67 in Content Host earnings (63,600 views/1000 clicks) and only $17 in YouTube earnings... sheesh, that sure wasn't worth the wait!
Some feel ripped off by Google while others feel that there may be a glitch in the system. But one publisher recommends "patience," explaining:
Settle down guys. The Partner program is definitely not a "get rich quick' program. Part of the low revenue is the economy and the other part might be the simple fact that an advertiser does not want to pay a lot to run ads on your videos.I have seen my YT amount drop to 1/20th or so what I would expect but content host amount is going up and that is fine with me.
Forum discussion at Google AdSense Help.