Usually the "obvious junk" is discarded by the editor of the journal itself (with help of reviewers if necessary). >since outsiders often pay for it. I doubt

Usually the "obvious junk" is discarded by the editor of the journal itself (with help of reviewers if necessary). >since outsiders often pay for it. I doubt the percentage of "outsiders" actually paying for individual papers is significant. Overwhelmingly, it's libraries paying subscriptions.