What can I do with the extra song? If I had an extra copy of a CD, I could simply sell it. But it’s not so simple with an extra digital file. It seems like I read a news story of someone trying to auction an iTunes song on eBay, but I never heard the fallout. I would guess something in the iTunes user agreement (who reads those things anyway?) would prohibit me from selling the song, but does it prohibit me from giving it away? (gee, maybe I should read those things)
It seems perfectly legit to me to resell the digital file just like I’d resell anything tangible in my home. As long as I don’t keep a copy of that digital file I’m selling (the copy from the CD would be a “different” file and I could certainly keep that one — afterall, I purchased it).