Indeed, I am sure that publishers do not like the idea of selling or swapping media. But that genie left the bottle a long time ago.
Swapster lets users trade CDs, DVDs, Video Games and Books -- and it's free!
I think the difference with digital media vs physical media is that you can't easily replicate physical media, and there is certainly a cost associated with it even if you did. Digital media is simply sent over the Internet for next to nothing.
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