Given the number of ghost written publications shouldn't there be a slew of retractions?

It's unethical, and generally a violation of journal rules to publish another's work listed with yourself as an author.

Then there's a journal editor that they pay, who they worked with to get a paper retracted, surely that should result in a re-review of everything involved there as well?

Has anyone done the work to determine which papers are involved and start the retraction notification process?