Like Andrew said, these are some of the more valuable and popular rookies in the set. Even thought they won't grade very high, it will at least show that they haven't been altered and for people who either can't afford the higher graded cards, or simply don't want them, they will be perfect.
i agree with the others they are key cards in a vintage set. another thing is by grading them you'll get an idea of what you should ask for them. Signed Greg