Very helpful article! I HAVE noticed that nearly all my money is coming from the two articles that have been boosted in the last month and I think ``what about the other 1,000-plus articles?" Pennies. So your theory about Facebook no longer being as much of a help makes sense...
That reminds me of the way the algorithm worked on NewsBreak (lots of views at first, then not so much)... Google is still finding our work, though. Last month, Google helped an article I wrote 14 months earlier get a crazy number of views (but as always, it's those internal views that pay).