I don't know much about AdSense, using it only on one site, but I think I have about 500 uniques/day (15000/month) and it amounts to ~70€/month at the moment.

I don't know much about AdSense, using it only on one site, but I think I have about 500 uniques/day (15000/month) and it amounts to ~70€/month at the moment. So it seems to me you should be able to earn more. The sources might make a difference, though - my visitors seem to come straight from Google (in fact 500 might be uniques from Google, not total uniques, it's the only number I looked at lately).