also, if your kids know the consequences of treating a book disrespectfully, doesn't that mean there was at least once where a book was endangered?
There's been a couple of books I've had to toss for damage. (maybe 3 or 4) for as much as my very young children use books and as many as they have I'm glad to pay for a few wasted books in the "game" of literacy.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar