Most people think they rely on cold hard logic to make every decision in their life. What they eat, how they dress, which music they listen to, what careers they choose, etc.
However, unless you’re a cyborg straight out of sci-fi movies, every human decision is influenced by not logic, but emotions. Anyone who believes otherwise is only deluding themselves.
And for this reason, stories are great for selling.
Stories communicate information in a highly specific and emotional way. They are easy to remember, and they give us something we can relate to as listeners or readers.