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That's extremely impractical. CD keys are a cheap way of getting many games that would otherwise be expensive. And arranging a middleman for every little deal is too much of a bother. You just have to take a little risk sometimes, after checking out the other person's credentials for red flags of course.
I trade Crysis Collection to this guy (KnG)
http://steamcommunity.com/id/dynamize/
http://www.steamtrades.com/user/KnG
And he give me a Saints row 3 Franchise pack CD-KEY which is invalid
I put the message in his board and he set his account to private instantly.
Seems i got scammed :(