This is not entirely true: Selling on the second hand market reduces the cost for the original buyer, allowing them to buy more media than they would/could without the second hand market.
That's assuming second hand prices below the original price. Inflated prices for rare works (which could be easily republished as digital media by the creators) are a different story.
That's assuming second hand prices below the original price. Inflated prices for rare works (which could be easily republished as digital media by the creators) are a different story.