Maybe there could be some bonus in getting all the imaginary armour pieces? Something like, if gathered all of them, receive a %boost in wisdom or % boost in exp? I dunno, it would be really cool since they're such a pain to gather.

EDIT:

Can you fix the birdman quest? It won't let us get the rewards

K,I will report it to my superior and may take your advice so that it can make our game more funny.