If I am correct, you are automatically experted at 6,000 points, but there are some users with 6,000+ points and are still not experts. Why?
Expert is a title that Moderators give out to users once they reach 6000k points. The logical reasoning behind this is that most of those users were from back where Pokemaster handpicked Experts and all, so that explains why the titles weren't distributed to certain users. I have gave Expert to the users who lacked the title.
6,000 points gives you editing powers, but until a mod gives them the expert title, they're still technically a regular user.