In-Game Purchases Poison The Well
by Kirk Hamilton on Kotaku, shared by Tim Marchman to from Deadspin > Sports News Without Fear, Favor or Compromise on (#39C14)

Video games will always manipulate us. Each challenge and scenario in a game has been carefully engineered to make us react a certain way. Most of the time, that's what we sign up for. But the moment real money enters the equation, something changes.