The "cost" of shooting out some e-mails based on a database of users is at best, nominal, and certainly a far cry from more wasteful things they do. Seems like this would be one of those damned if they do, damned if they don't situations though. If they didn't do this and someone flew and caused an issue, I'm fairly certain we'd see a -1 for the FAA for failing to issue a warning, didn't do their job and they should have because some of us paid $5.00 for a registration...etc etc etc.