The stars sort of grow on you as you add posts.
After you make a certain number of posts you gain a star as well as a change in your title. Exceptions are the moderators, with a further exception of Plastic Squirrel who gained his title and stars as a joke when he passed 1000 posts, because he was trying too hard. :D He's a good guy though and we should let him see his real title, because the joke has grown a grey beard by now. Oh, and blatant posting just to up the numbers is frowned upon and may be edited or deleted by the powers that be, meaning Taz and myself. :)
'Share and enjoy'