This is similar to videogames resale (Another area under heavy attack by the publishing industry).
If a title is middling, but not great, people will still buy it, and hope to sell it for cash or store credit once "done". They will experiment with games they're not certain about because they're not "Stuck" with the original.
People who aren't willing to take the risk that the game is worth full price can then buy the resold version at a lower price later. They take a "Newness" and time premium, but save money.
If resale isn't possible, fewer people will buy the original game because it's a riskier proposition. This means both that there are less primary sales, but ALSO that there are less people discussing the game (They've not played it, they can't talk about it). People who would have bought the game secondhand, possibly liked it and been encouraged to buy the next title by the same developers firsthand simply won't buy it, so there's even LESS word of mouth.
If a title is middling, but not great, people will still buy it, and hope to sell it for cash or store credit once "done". They will experiment with games they're not certain about because they're not "Stuck" with the original.
People who aren't willing to take the risk that the game is worth full price can then buy the resold version at a lower price later. They take a "Newness" and time premium, but save money.
If resale isn't possible, fewer people will buy the original game because it's a riskier proposition. This means both that there are less primary sales, but ALSO that there are less people discussing the game (They've not played it, they can't talk about it). People who would have bought the game secondhand, possibly liked it and been encouraged to buy the next title by the same developers firsthand simply won't buy it, so there's even LESS word of mouth.