Well, It just wont work THAT way.
You have to be a friend friend, not just someone who has said great job on her drawings, someone who laughs, feels, and does for her, like a real friend^^
I know, a lot of poeple love Nattie-san, but just for her hands, not her awesome personality. But, No I don't think you'd have to draw good to be on the list, I mean look at me, I'm not good, but I am on :3 Haha, I just love having Nattie-san near, always making me laugh on my compter x3