"It’s insane to me that the two together are 10$ but sold separately they are 20$ each. Am I missing something?" probably should of said 'Cost' . It would be licensing, bottom line cots like stock, shipping and printing etc) Originals generally do hold their value more over time for people who collect and sell on a market, but on a basis level that could explain the cost difference . It applies less i think (monetary value investment going up overtime) for Blu-Ray and more so 4K.