Everyone follows along with the biggest box office draws, top selling games, Billboard Top 100, and best seller lists, but how can you compare them? How Iron Man was trounced by a scruffy car thief tries to quantify the GTA lucrative launch against other mediums. The book "Harry Potter and the Deathly Hallows" sold more than 10 million copies at launch. That's actually four million more than Bellic, but the Hogwarts student's final adventure cost about half as much as the game. *NSYNC beats them both, the pop quintet's "No Strings Attached" holds the record for biggest first-week CD sales with 2.4 million copies when it was released in 2000, according to Nielsen SoundScan. That's far meeker than the first-week success of "Iron Man," "Deathly Hallows" and "GTA IV."