I suggest that , should we have a drop high chance to get stated items in dungeon [ "x +4 x +4 in equipments], it will be good in game to have that such items so it will be new. Mostly we can get is [ stated x +2 x +2 ].
Suggestion : Add more Items in NPC Guild Market or Replace EC rewards with Players points /something new ,where they can be used it to buy some good unique items.
Reason: To be entice players to participate in Guild Siege.