I really see FB pushing revenue generation now. I have a page with 10k+ likes. My posts used to be seen by about 1000 of them, 1300/1400 on a good day. Now I'm lucky to have them seen by 700. They always get a good share of shares/clicks/likes/comments: that hasn't really changed at all.
But I've promoted a few and I think FB has seen that and wants me to do it more often. As my likes go up, the number of eyes I reach for free is actually dropping and dropping.
It's becoming like everywhere else: pay to play or gtfo.