Answer:
The more you have of it the less you see. What is it?
What goes up and down stairs without moving?
When you take away the whole from me there is always some left.
I make billions of dollars selling windows. Who am I?
I am whole but incomplete. I have no eyes, yet I see. My largest part is one fourth of what I once was. What am I?
Long and slinky like a trout, never sings till it's guts come out.