Mirage, as one who works in the publishing industry, used book stores are a damned parasite, especially in college textbook sales. I've seen the numbers. I've seen the cost of what goes into making a textbook. I can confirm there's a damned good reason those textbooks are so expensive, and a good chunk of it is because there is no major profit outside the initial release, much of which is due to used books sales. While I doubt it is the main factor, I would not be surprised that this is also the case for video games.