It is because the graphic designers who worked with those original labels had full access to the artwork of the original box art for the games, so it puts us at a disadvantage if we wanted to make a legit reproduction of it. But hey, what can you do.
EDIT: Oh you meant the grey bar on the bottom of the case. I'm not terribly disheartened by it. As long as one likes it, then that's kosher by me.