That's a good idea. I have a couple original books that are just in garbage condition.
I only have one original shrink-wrapped book, and I didn't realize it was when I bought it. It's a minor Judges Guild release, so it's not really worth anything. But I still have an aversion to unwrapping it.
I did buy a partially shrink-wrapped Revenge of Rusak because that was one way to make sure it had all its pieces. The shrink wrap was present, but shredded, so I didn't feel bad about actually reading it.