Personally I am happy with everything I got for the money I pledged ($600).
But looking at Steam I do think 9.99 for a the source hunter DLC is pretty steep. You get a few in game item and then a few goodies next to the game like a digital art book. I would expect much more for 9.99. As a consumer I would feel ripped off for that.
You also get the digital soundtrack with 22 tracks and the design documents.
You usually pay up to $1-2 for a digital song on iTunes or Amazon so the price is imo not that bad IF you are a fan (everyone else shouldn't buy the DLC anyway)...
