Advantages for Editors
The editorial polices that you apply are up to you. You choose what criteria that you apply to accepting articles.
The publication process happens as and when. You don’t have to get many authors and reviewers to get their words ready at the same time. The task of chasing reviewers does not fall to you at all. While you are free to specify the editorial controls for your own journal, you don’t even need to select the reviewers in the first place.