I've been pretty good so far, only bought:
All the Skyrim DLC, because I need to play another hundred hours of that.
All the Saint's Row 3 DLC, because Witches and Weiners.
Surgeon Simulator 2013, because I guess I didn't really need that $3.39 anyway.
I gifted my friend who just joined Steam SR3, though, so my work is done.
Also sold a trading card for fifty cents. I think the card thing is pretty dumb, but if some random asshole wants to give me half a buck for a picture on the internet, I'll take it.