To counter the argument of opening data to the outside world, LinkedOpenData has been studied inside companies. I.e opening only inside the walled garden. And guess what? It failed. Simply because companies are not organized so data can "travel" flawlessly. Companies are organized as silos. With boundaries & (implicit) contracts between people, teams, hierarchies. Of course, everyone knows the information is somewhere here or there, but eventually it is a real hard job to get it for real.