GameStop is the latest and most legit avatar of selling second hand, or "slightly used", cartridges and discs at a cheaper price. Now, Microsoft seems interested in this resale business and is conducting a survey for Xbox gamers.
According to the leaked survey, Xbox gamers are being sampled whether they're willing to sell a title back to Microsoft in return for 10% of the game's purchase price as in-store credit. However, compared to rates by GameStop, that's almost insignificant.
Of course, it's just a survey and Microsoft might just be inquisitive about knowing what its gamers think rather than hints at a business plan. It does, however, hint towards a shift in the gaming market.
Once considered a niche, digital game distributions like Steam on the PC and the Xbox and PlayStation's respective stores have now become the one stop destination for gamers, at least the non-collectors. The market for that might have developed big enough to deserve a "second hand" sub-market as well.
Buying and retailing used discs and cartridges makes sense, whether to decrease clutter or to help balance lack in supply, especially with older titles that have gone out of print.
But, there is less business incentive for such a program since there is hardly any cost involved in distributing a digital copy of the game and theoretically supply lasts as long as developer and publisher have it available for download.