I was recently at a conference in Washington, D.C., on computers and libraries, and one of the things they noted at that conference was that there are three tiers now for authors. There is the gold tier where the author will actually pay the publisher to include their work in the publisher's publication in order to get that recognition.
I'm suspecting that is happening more and more with the larger publishing companies, because a researcher wants to get their research out there and they're willing to pay to get their materials published, but it is not directly impacting a library that would pay the publisher to get access to the database where that piece of material is published.