Riddonkulous

I am the price placed on a wanted head, a number nailed to doors and widely spread, I turn the public into hunting eyes and make the fugitive a living prize. I grow with danger as the desperate flee and shrink when justice finally holds the key. I am the economy of capture made, the coin that turns a neighbor to a trade. I am as old as outlaw and as law, the market value of a wanted flaw. What am I