[cup-of-tea]

How much money do you think it costs? Peer reviewers aren't paid. The typesetting is low quality and done in India. Difficult bits like figures and tables must be done by the author with no help from the journal. The printed copies are low quality and contain advertising.

[ocschwar]

Part of the cost is that the editors have to read through everything to filter what goes to the peer reviewers. If you keep sending junk to the reviewers, they drop out of reviewing.