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Now that Lego owns Bricklink, we're probably not going to be able to buy factory reject pieces in unique colors anymore.
I'm guessing Lego is going to implement a strict list of "official" element numbers and simply disallow any listings that don't conform to their checksheet. You'll still be able to buy a 1970s rooftop TV antenna piece, but you won't be able to buy a torso in a misprinted color.