That'd be a silly reason. Because Bristow is what, 2 hours from DC anyway.
Also, I have a question. If I don't want to charge all 4 tickets on one credit card, would it be possible to buy 2 on one card and 2 on another? Or would I only be allowed one transaction?
Edit: Called Ground Ctrl customer support, they said I would be able to do this because the number of tickets purchased is tracked by account, not by card. Sweet.