It varies too much by topic, site type, and where your visitors are coming from. I was once regularly making $1000 per ~10,000 pageviews on a certain type of site. At the same time, I was making $800 per month on another site doing ~200k pageviews.
Sadly I only make about $150 a month in all now, but I filled my boots and sold some of the sites.
Sadly I only make about $150 a month in all now, but I filled my boots and sold some of the sites.