This is a follow-up/correction of this previous question (which I cannot alter since it has been answered, but was advised to ask a new question instead).
Of course, journal publication has its costs, but some journals/publishers charge excessively from their authors at a rate much higher than necessary to cover the costs, say in excess of 2000$/£/€ per paper.
In times past, the purpose of journals was the dissemination of research results, but now this can be done online (e.g. via the arXiv), so the only remaining purpose of journals is the peer review process. In other words, peer review is the only remaining important part of article processing.
If this is so, shouldn't the reviews get appreciated in a way that reflects their benefit to the publisher? (For example via vouchers that can be used in lieu of (part of) a publication charge.)
Should one keep reviewing for such journals (that charge authors excessively) if they fail to offer appropriate appreciation?