Answer:
When you buy me I am costly, but the only use I have is hanging only. What am I?
I can be driven but have no wheels. I can be sliced but still remains whole
When set loose I fly away. Never so cursed as when I go astray.
I can sizzle like bacon, I am made with an egg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole. What am I?
I march before armies a thousand salute me. My fall can bring victory but no one would shoot me. The wind is my lover one-legged am I. Name me and see me at home in the sky.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.