I know a little bit about the academic publishing business from my mother's experience working in the field. This analysis is missing a critical factor.
In the old days, many journals were paid for by individual subscriptions. Professors, mostly, would buy a subscription to be sent to their personal home or office. Back in the days of dead-tree journals, having a copy of your own was more convenient than trekking to the library to see if they have one. But, with the internet, there's no need for a personal subscription, and almost everybody gets journal access from a university library.
Because the library fees have to cover more users, obviously, to stay in business, academic publishers have to charge more for library fees. This is terrible if you're not affiliated with a university, of course. But it's made necessary by the drop in individual subscriptions.
University presses may be charging a lot, but they're not living high on the hog; mostly, they've been cutting journals in the past two decades. Like the rest of the publishing world, they're finding it harder to stay afloat in an environment dominated by the internet's amazing ability to copy and share content.
Why do you bring up university presses? No one else singled them out. Usually when people do, it is as the baseline reasonable journal cost, an order of magnitude less than commercial presses. In this context, of single articles, they use the same pricing as commercial presses, but that's probably incompetence on both parts.
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Razib Khan found this paragraph rather striking (who is reminded of this episode of South Park) and I would tend to agree that its a rather convincing argument.
Are publishers really so successful as rent seekers or is there something the original article is missing here? Also what useful strategies would LWers recommend to help minimize costs for someone trying to practice the virtue of scholarship? The obvious suggestions (implied in the article) seem to be emailing authors (and perhaps those suscribed) asking for the papers and acquiring and paying for membership in some libraries.
Another obvious option is using ... liberated databases of such academic papers.
Edit: Just wondering, has this been discussed before on Lesswrong?