If I click the "users" tab on the navbar, then the "staff" subheader, I am taken to the same page is if I had clicked the "Top Users" sub item. Those users are great, but only some of them are staff. Most are just duders. Possibly related is that the "role" column is not sortable, though that seems like it is probably intentional.
I assume this is the same thing as Filtering users by Staff doesn't filter anyone.
This was an intentional change after the last hacking attempt. No sense in giving people a list of accounts to target. We just haven't gotten around to getting rid of the link yet, I think.