What if Nous & PPR Published More?

For the past few years, Nous and PPR have stopped accepting submissions for about half the year. This is, as they say, because they have such a backlog and their acceptance rate is so minuscule that it doesn't make sense to accept submissions all year. I wonder why they don't start publishing more issues. If they published bi-monthly instead of quarterly, they could accept more articles and have a shorter backlog. And if they have such a backlog, and they get so many submissions, and their acceptance rate is so small, the could do this without reducing the overall quality of the journals. What would be the problem with that?

--Mr. Zero