Just a heads up -- the way I (poorly) understand the booking curve for the front cabin is that the full J/C seats are sold at the very end of the flight and do not lend themselves easily to forecasting. Thus if there's any doubt, you'd want to leave the seat open for a potential 3-6k (one way!) ticket as that's a significant chunk of change for the airline. Anyways, while it's frustrating not to clear in advance, I can't blame for the current system, especially now that upgrades can clear at the gate.