I've made a pretty serious error of judgement creating a view for a client that shows users created before a date AND still active. The error was adding a date filter.
This was meant to be used at the end of each month, and it was, with an email of users sent to the client. Now, after many users have been blocked, they're showing back on the view I created.
With quarterly billing, this is an issue as new users get counted fine, but any old users who have been blocked since don't show. A year from now, this period could actually show zero users.
The accounts were blocked using the editable_fields module.