Earlier quoted context omitted.
The first fact you need to deal with is that open access journals, started to explicitly counter the cost problem, have similar costs. If it was as simple as you think it is, open access journals would be much cheaper. (Arxiv is not peer reviewed, and does not count.) The second point is that publishers costs are around 70% of revenue, as the article says margins are around 30%. That means there's a limit to how low…
> (Arxiv is not peer reviewed, and does not count. Oh it does count. Peer reviews in journals are done by scientists for free. Peer review adds completely negligible costs (or even ZERO) to a journal. ArXiv is the perfect example.
Then can you explain why arxiv costs around $10 per paper, while plos charges over 100 times as much?