alt Hacker NewsBecause there isn't such a relation. It's a thing people believe when they don't have actual experience with peer review. If anything, predatory journals and low-quality pubs can charge more, since publication is more guaranteed (and researchers reaching for these pay-to-publish journals are more desperate).
It's a reputation economy. Like review sites. They start off truthful, and then as time goes on incentives shift to bad actors to subvert it. Or they just sell out their reputation.
Yelp, TripAdvisor, wire cutter, hell even Google results themselves.
Once you start poisoning that well, it's difficult if not impossible to claw it back.