It is depend on your keywords and where the click from. Click from asia country is very low rate so it it still much better than another PPC programs
I think that key is the niche and quality traffic, be careful showing your adsense stats, it's prohibited.
also I have the same problem, the earning rate very low !!! I think the traffic should be from search engines like Google to get more profits !
it depends on your niche. If your niche is in some payless cateogry like wallpaper and layouts, the pay will be less. If your website is about making money, losing weght, etc, the payment will be more.
There are a few things that might affect your low earnings. Depending from where your clickers come from, the earnings will vary drastically. Secondly, your earnings would increase dramatically if you just improved your CTR. There are ways to get the CTR to 10% and above, but even if you got just 5% instead of 0.05%, that would be a tremendous increase already. A few things you might want to do to increase your CTR is placing the ads above the fold, using an adsense friendly theme, making the ads color blend with those of your site, putting them within articles/below titles of articles, putting images close to the ads etc.