Why not make Unique Encounters into server events instead of capture, hide them, only let people you like participate and keep all the goods for yourself fights? Honestly, it seems like there is a Freedom-wide Unique Cartel.
For example: Blue Dragon arrives! (blue beam shoots into the sky and you have 3 days to gather resources and prepare), 3-4 waves of dragonkin minions pour out of a blue-ish castle sparking with electricity and throwing random lighting bolts into the field of battle. After the last wave, Blue Dragon emerges and fights to the death. Hides, scales, bloods and other loots get distributed like Rifts where the more you participated, the higher the loot you get.