Answer:
The more there is the less you see.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
Before I grow I'm small. When I'm old I grow tall. When I die I give a mighty fall.
I'm the source of all emotion but I'm caged in a white prison.
I am natureβs way of applauding lightning.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.