That something extra, I believe, is a certain humanity that comes from upbeat and positive human interest letters and success stories. Advertisers like to be associated with those qualities.
“I think it's important to keep your personal life to yourself as much as you can. It protects your sanity and you need to have boundaries. And it helps that enchantment of watching an actor. If you know someone's favourite colour or what they like to do on a Sunday, you won't fall for the character ”