Martin Paul Eve and Ernesto Priego have published "Who is Actually Harmed by Predatory Publishers?" in tripleC: Communication, Capitalism & Critique.
Here's an excerpt:
Predatory publishing refers to conditions under which gold open access academic publishers claim to conduct peer review and charge for their publishing services but do not, in fact, actually perform such reviews. Most prominently exposed in recent years by Jeffrey Beall, the phenomenon garners much media attention. In this article, we acknowledge that such practices are deceptive but then examine, across a variety of stakeholder groups, what the harm is from such actions to each group of actors. We find that established publishers have a strong motivation to hype claims of predation as damaging to the scholarly and scientific endeavour while noting that, in fact, systems of peer review are themselves already acknowledged as deeply flawed.