I've been going through the excellent WP Tavern blog on WordPress news today, and I stumbled across this post on how much bloggers can expect to earn from the Jetpack-powered WordAds platform.
tl;dr: Not very much. But the numbers are all over the map. One thing WordPress tells you: better content, more money.
Linked from the article above, a blog that makes about a month from WordAds on 2,600 to 16K page views.