It seems like casual PvP and non-PvP players are liking them. No zergs, no queues, mostly pve with a small chance of running into a few enemies. From Zeni's perspective, there's probably value in leaving those campaigns open just to placate that player base.
Judas Helviaryn wrote: »Don't incorporate bugs into your builds, and you won't have [an] issue.
If it doesn't include nerfing or clown crates, it's not on their agenda. That said, having one nearly empty campaign is good for those who wish to quest or get gear from the towns.