Dead Space 3 Why is it just add-on content

[sirjoshd109]

I just found something describing the limited edition of dead space 3 saying that the only difference between it and the original copy is add-on content, Why are they doing this i'm so disapointed I just became a fan of it too, and the worse of it is usually the limited edition add-on content will become available on xbox live a few weeks after the game is released, why are they doing this, why not include a marker statue, or a book about necromorphs of something, anythings better than this.