Theory: London was only playing stupid.

Think about it: a DUMB Asian? Not likely. Here's my thought: London realizes that one day the Tipton will no doubt pass to her, her birthright and all. But she doesn't want the responsibility. She wants to hang out, have fun, be a normal teenager. She figures, if she pretends to be totally stupid, scatterbrained, and incompetent, Moseby and her father will have less faith in her, and therefore put less pressure on her. She has, in fact, been shown on a few occasions, to be pretty sharp. After all, she often goes on solo trips abroad. Who knows what London is really like, among other rich friends? I could imagine her visiting places like Italy, Spain, and Japan, reading and studying the history and culture and art. She only PRETENDS to not understand stuff like literature and mathematics, or how to not do a job. She just doesn't want the RESPONSIBILITY her family ties demand. I've even read a few fanfics where my theory is confirmed, where she is indeed very intelligent, and is only acting to throw off responsibility. What do you guys think? Also, I used to, and still do, ship London and Maddie!! I've also read femslash fics of them!!!