That's not really true, I know the CPM on my blog for example is at least double that of what people on the BA platform receive (and my total traffic is a lot less). OMAT & VFTW might be getting a larger slice of the pie, but I doubt it's double what others are receiving. Bundling display ads isn't as lucrative as it once was.

I don't think these stats are really that surprising, those working at this full time are posting more than those who post part time.