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why do you expect it for free? what is a reasonable charge, in your eyes?why is that charge reasonable and $15 isn't?

I don't know. Usually I see arxiv posted a lot here, and I can access those without issue.

If I do pay, do the authors of the paper get my money?

> If I do pay, do the authors of the paper get my money?

In general, no.

Because there is usually an effort in HN to post non-paywalled links.