One of my lesser (page views wise) sites has undergone a transformation in the SERPS between 14 Feb and 24 Feb. It's not unwelcome because the page views haven't changed but the income has gone up.
It's a very simple site about widgets. First level is blue / red / green / black etc widgets. Second level is individual widgets within each category. There are no other levels / differentiations.
It always was a very high earning site per click but the volumes were very small. Less than a thousand page view a day.
Prior to 14 Feb and going back forever, the most popular pages were always at the second level - individual widget pages. Suddenly over the last week or two the individual widget pages are less popular but the blue / red / green / black etc widgets are now vastly dominant.
Same overall page views per day, just a shift in emphasis. It's welcome because the earnings have doubled.
The site has been running for four years so why the sudden change in the type of pages viewed? Any ideas? I haven't updated the site for eight months or so.