"The ultimate effect of pay-to-play is that the traditional peer review and refereeing process has broken down. If a dishonest researcher gets rejected from a reputable journal, they can take their paper to a pay-to-play journal and have it published there. With over 10,000 academic journals, it’s impossible for the lay public to track which journals are reputable and which are not. As far as the public is concerned, a published paper is a valid paper."
Ok, but I take some issue with this.
Most scientific papers are not intended at the general public, but at experts working in the specific area that the paper covers. Also, often these papers are not even understandable by a phd outside the area, let alone a lay person.
Which journals and authors are reputable are known to experts in the area. "Pay to play" papers published in obscure journals will not get much attention or be taken seriously.