It definitely does feel like the reward for FATEs is a little lacking, and I'm not really sure the Shared FATE system really did anything to fix the problem as it is. Maybe if the vendors opened up by higher shared FATE ranks had more meaningful items. Still, I can understand that it must be difficult to balance. If they make FATEs too rewarding then everyone would do nothing but FATE train and that wouldn't be good for any of the content that's not FATEs which just ends up shifting the problem.