Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
I occur twice in eternity. And I'm always within sight.
I have a pet, his body is full of coins
What is always coming but never arrives?
It is where kings, queens, knights and bishops go to war together.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?