a quick look at my usage log shows that pageviews are off. I make about 60,000 more a year than they guess at. I imagine I'd have much more ad revenue if my site wasn't such a small-niche audience. Tinwhistle ads pay abysmally low. I'm not sure if my agreement with google prevents me from disclosing how low I've estimated they are, but trust me, it's pretty low.
If I had real-estate or gambling ads, they'd probably pay a couple dollars per click, and I'd be making a lot more bank. heh