Great article! Thanks for sharing.
I've never had the pleasure of witnessing such an event but understand why the airlines police FC especially when it comes to international flights. I would say to comments made by Boomer and others that if a flight is not booked full in FC/BC that there should be an option to purchase/upgrade at time of check-in for a few extra $'s. The airlines at least increase the revenue figures for what would go for $0.