I think its based on example. Someone looking to sale a car. They have an idea what they feel that the car worth. So you browse threw ads looking at cars about the same as yours. And you see the same type car listed for 20,000 even though you thought yours was only worth 12,000 or 15,000 but you list it for 20,000 because that's what you see what the quote unquote other guys prices. So why not!