CountChocula
Keeper of the Watch
I honestly assume those numbers are very misleading - the majority of the 38% are probably playing Facebook games like Farmville. I don't like such gimmicky games being considered when discussing gaming stats, as it's possible for them to have 50 million players or more. It completely messes up the stats.
Whether they are playing Angry Birds or Minesweeper on their iPhone, or TF2 or some other game - that is still a shocking number of people playing F2P games. 38% of the entire US population?
It may very well be a contributing factor in the decline of these TOR and WoW subscriptions.