> The publication costs in PLoS journals are 20-50 times higher than your high end[1].
I would think that the cost of actually making it available (no vetting, just throwing it online) is probably much lower than the cost of publication[1]. Note that, from your link, the expenses in the price include "peer review, of journal production, and of online hosting and archiving".
[1] If it really does cost them even 50% of the prices they're charging to put a single paper online, then either most of it is being eaten up in bureaucracy or they're investing it and using the interest to pay for the hosting (which would make a lot of sense, actually).
I would think that the cost of actually making it available (no vetting, just throwing it online) is probably much lower than the cost of publication[1]. Note that, from your link, the expenses in the price include "peer review, of journal production, and of online hosting and archiving".
[1] If it really does cost them even 50% of the prices they're charging to put a single paper online, then either most of it is being eaten up in bureaucracy or they're investing it and using the interest to pay for the hosting (which would make a lot of sense, actually).