I did the same thing with the Company of Heroes expansion. I bought the pack with both thinking I could gift the original to a friend. It worked for The Orange Box. I thought it was a Steam feature.
Steam Support didn't help much:
Registering a CD Key / Steam subscription to an account which already contains some of the games included with the package will result in all the games included in the package being bound to the account, even if some of the games were already associated with the account. Unfortunately, we are unable to offer you a discount / refund for the duplicated titles.
I got excited to play Multiwinia, and then a couple of minutes go by, and my excitement diminishes. Games that are born dead suck. I have a similar problem with BF 2142. There is only one fully populated server in Brazil and it usually runs a crappy map.
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Steam Support didn't help much:
Will Vodka Drunkenski make a comeback?
It's a fun game at first, and it got me into it faster than Command and Conquer. But in the end I thought to myself, I'm bored of it already.