I'm not the one who picked this concept. Voudou seems to think that some stuff shouldn't be sold because it cannot be easily replaced, if at all.
I do think, however, that the effective market price on our "masterpieces" is limited because a lengthy backstory is often needed to explain the significance. Yes, shooting up requires some history, but not much. Smack and a sidekick says it all. You also don't need a lot of backstory to appreciate Guernica. Another example would be the ECC cover depicting the Klan. You don't need to know much to get it. If OA is to find a wider market at the high end among people who might care about the details, it is likely to be these kinds of pieces which lead the way, not the first appearance of Mr. Superduper, a third rate villain who sometimes fights a second rate hero. But some art, like the Rocketeer and Betty, don't need a back-story to love. Same with some old Black Cat Mystery covers.
With that said, I agree with you that there really isn't anything "priceless" which justifies keeping--except for nostalgia reasons or something personal that resonates.