Ray Marden wrote on Dec 20, 2010, 18:34:
It's a developer decision, but it's just about only Valve that lets you gift "extra" copies of games, else they just disappear.
If you are concerned, it will tell you prior to finalizing purchase - it will state "You already own <Game XYZ>, you will/won't be able to purchase additional copies." Well, something to that effect...
Kind of like reverse piracy by the publishers. ZOMG.
Having picked up all the Oddworld games as well as the newest PoP,
Ray