Mad from a guests point of view, amazing from thorpes view. That way they can maxamise sales and make more money. Also I find it very hard to believe that the smiler has a 10% allocation. When there are no fastracks that queue moves almost twice as fast, not saying its a 50% allocation just that it seems an incredible amount more than 10%.
Also locking systems use 2 or 3 ratchets, if you somehow manage to get all 3 to fail then the seat belt will act as a fail safe, however as that is so unlikely the purpose of a seat belt is to prevent all seats being released at the same time. They are not their as a 4th fail safe.