I have ONE page on my site that caters to 14-25 year olds. My site is new, and i dont get much traffic, but THIS page gets around 500-1000 uniques per day. My CTR on this page is way below .05% . CTR on my other pages is around 9%-25% (but much lower traffic).
Guys, it's against AS TOS to disclose your CTR without Google's specific permission.
As for the earnings- even with maximizing ad position and palette, some niches don't get much clicking or don't have high bids- e.g. I found that sports and celebrities were horrible topics for earning money via AdSense.