For items that can be copied identically for basically nothing and never degrade? The only reason we even still have a first hand market for these things is that we want to compensate the producers of the work who still need to earn money to put food on the table. To do that we use the ridiculous concept of "intellectual property" to allow those producers to work within a system not designed for a post-scarcity space. I cannot conceive of a 'second hand' market ever making sense here without just piling on even more perverse concepts.