I just wondered how often do you guys report a post or new thread to moderator. I am talking about the button "Report to moderator" which is at the bottom right corner of every post.
When account farmers would see that their one-liner posts are getting deleted, this would also discourage them from spamming and burst posting.
For every post you report, 5 more appear. If every user reported posts as much as they posted, then we might be able to see a decline in spam. However, the problem is that dealing with the reports takes time. And the fact of the matter is that sometimes, users will stick around despite having their posts reported & deleted multiple times. (Some examples are out there, I don't have them on hand right now)
Spammers have gotten a lot more annoying now. Rather than the grand majority posting one-liners, you have a divide of users that create padded and recycled posts and others that will separate their one-liner across multiple lines. This only makes the reports take longer to handle.