Some excerpts:
Average CPM for business & finance: $6.15
Average CPM for technology: $4.56
Average CPM for style and beauty: $1.48
So at $4.56 per thousand views, assuming one ad per page, even if an article does 20K views, that's only $91. This is why news organizations look for differentiators; it's what we did when I was at Wired and CNET, though I was on the editorial side, not advertising. Unfortunately not all news organizations succeed; Gigaom did events and had a paid research arm, but that wasn't enough. I'm also still mourning Dr. Dobb's, which I first read as a teenager. :(