Keep the copies that mean more to you - the ones that 'speak' to you and more represent your own ethic and the person you are. Usually these will be the first edition/first printings and signed or inscribed copies. The copies from a more recent leatherbound set are only valuable as part of that set - not individually.
I have purchased additional copies simply to get a better dust jacket for an inscribed original, and so forth.
In the end it won't matter a lot, except to you and the person you perceive yourself to be.
Be true to thine self.
