Answer:
If you have it, you want to share it. If you share it, you don't have it.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
Come up and let us go. Go down and here we stay.
Only two backbones and thousands of ribs.
Do you know what you can hold without ever touching it?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.