Original masters should be preserved and not re-used. They are cultural heritage, indeed. Duplicates are for re-pressing the recordings; Chuck would know more about this.
But I will say this: If you're going to spend the "big bucks," buy an original, a decent Liberty or a nice King pressing. I don't know what the "ideal" sound is on these Hoffman things is anyway, and nor do I care. I am a follower of music, not stereo test situations. This whole thing is niche marketing bullshit, designed to re-sell the same titles over again to people who don't know or don't care about what's actually "out there" to listen to. I'd buy five new CDs on Ecstatic Peace before I'd buy a Hoffman reissue, and two Maria Schneider records before one Classics reissue.