Answer:
I have an eye but I cannot see. What am I?
I am always coming but I never arrive. What am I?
I am a king who’s good at measuring stuff. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
What can you lose that will cause other people to lose theirs too?
No matter how little or how much you use me, you change me every month.