It seems reasonable to me to pay a small one-time publication fee for an open access journal, to cover clerical and typesetting work (professional typesetting is important and expensive). Predatory journals exist and would exist independently of what the best practices of good journals are.
I have received plenty of emails inviting me to submit work to predatory journals, but their low quality and lack of peer review and general ethics is pretty obvious and they are easy to avoid. They feel more like a spammy annoyance than a real threat.
