"additional content continues to strengthen your position.
I've noticed that google is getting much more particular on which pages will be pulled for a search phrase. That is, the algo seems to be getting more specific. As a result, you need to create more pages with different titles that address various aspects of a topic. Instead of a 20 paragraph page, breaking it up into 3 or 4 pages that each address the subheadings of the topic will garner more traffic and more adsense revenue.
More work, of course, but more reward." ownerrim