Throw out the wooden planks, and get a new case. I suggest putting the heavier books on the ends, and the lighter ones in the middle so they don't snap.
Oh God, I completely know what you mean D: My dad HATES books too, so he's always like "Get rid of them! You never read them! Horrible things!" but I can't do that. They're my babies, ahah :3
I've got the lot of books that lived in my bookcase, about five boxes full in our attic and a couple more stashed under my bed and in the airing cupboard. I'll probably get new bookcases sooooon, but I'm gonna miss those ones.
I'm in the same boat... Kind of. I don't have any breaking cases, but I'm sure I'd fill up a large space with all my books. I have books everywherein my room. And it's not even all of them. I have a full bookcase at home, and like 4 boxes filled with books at my sister's house. My family keeps bitching at me because I keep bringing home more books. They're like, "You need to get rid of some of them!" I'm not. I'm going to be one of those awesome, kooky English teachers with a small library's worth of books in her classroom. :D