At the Libertas Academica blog, Tom Hill posts a list of OA publication processing fees, which, he writes, "are one of the most vexed areas of open access publishing." He adds tips on how researchers can get the best deal for the smallest fee, and says to consider the additional hidden costs of publishing and whether the journal is truly open access. Most of all, he says that high author fees harm open access, writing this:
OA has not 'won' the battle against conventional journals. We have many authors left to convince and outrageous fees make it seem as if the publishing industry has moved from one form of exploitation (escalating subscriptions with the threat of loss of access if they cannot be met) to another where fees massively outweigh the actual costs involved in processing a submission.