I can't speak to which version might have more monetary value, but I like to have both. The originals are cool to have just because they are the originals and used copies are extra cool just because I love old books. The expanded versions are necessary to have because I'm greedy like that. If I loved the story in its original form, I want more, more, more!
And thanks to you as well for stirring up some new discussions and adding new input to a few of the older ones.