The authors committing review fraud probably are not trying to publish fabricated research; it's more likely they were attempting to make it more likely that their research is published.
Most articles are not rejected by reviewers because the research is "wrong"; rather because they are not significant enough, or other papers are better.
It seems that part of the publishing apparatus discovered this flaw as the journal was undergoing a shift in publication models. In that all parties have an interest in the ongoing viability and prestige of the journal, and most often institutions respond to scandals by either coverup or diminishment, who benefits from the news and which party wants to contain the scandal to the review process only?
Grandparent has it right. This is all about the pressure on authors to publish, and publish quickly.
A sociopath looks like the Sames-Sezen affair: http://blogs.sciencemag.org/pipeline/archives/2011/07/08/the...
Even there a certain blogger said that he knew "Dali Sames not to be a nice person", whoever went there knew exactly what he was getting into.
It's an important metric, of course they'd list it.
Theranos ring a bell?