Is there an ability that lets you instantly delete all members with 0 posts?
<-- closed to prevent unwarranted responses -->
ACP >> Configuration >> User Pruning
Set that up then run the task manually in Tools & Maintenance >> Task Manager >> User Pruning >>click the little clock icon
This may be a REAL old thread, but the instructions still work.
Cleaned house and got rid of a bunch who have never posted anything since 2011!
Hope they haven't been lurking .....