The reason there's little organization to most malls is because of capitalism.  If a store goes under, they owners of the mall aren't going to wait for another store that begins with M to come rent out the space.  It'll either go to "first come first serve" or more often than not the "highest bidder", especially if the mall is doing well.  Of course, in malls like the one in my town, we have several empty spaces and I'm sure the owner of the mall is looking for anyone to fill the space.  That's likely why we've got some very odd stores in our mall.