Yeah, THC is not soluble in beer. It's barely soluble in pure ethanol. Plus, the acidity of the beer would likely isomerize it to a less psychotropically active form.
So, as yooper said, it's a great way to waste some good pot and ruin some good beer.
Primary: Stone Vertical Epic 08.08.08
Secondary: Oaked Arrogant Bastard
Conditioning: Dead Guy Ale clone, Double-Dubbel
Drinking: Not for a while