I find this system a bit odd too. I understand that this kind of business has to be profitable, but it doesn't need to be this profitable. We don't need to sell out scientific publishing.
Yeah lots of public money gets wasted on this kind of companies. Similar trend with conferences being organized by for profit private companies.
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There are so many creative ways to spend other people's money.
One of the problems is that almost no one reads academic journals, so the main beneficiaries of publishing are the authors who do it for promotion and tenure, rather than the readership. Since that's where the demand is, that's who gets charged.
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