Why not? Or did they never implement that after they said they would? I never actually tried.
Can you find a source for that.
I cannot find a method to transfer games.
I have never seen one.
With Valve clamping down on the abuse of the gift system, I doubt it would be available still.
If it ever was possible in the past.
I remember reading somewhere Valve was going to implement that. I remember cause I was thinking of giving my Masquerade Bloodlines to my cousin since he wanted to try it and I was never going to play it.