Why do you think the game has been so successful?

Well, interestingly, I think, Doom has always appealed to an older crowd. Typically and traditionally, id has been a PC-focused developer, and the PC demographics always cue significantly older than the consoles because you are not going to let your kid play around with your $2000-$4000 computer, plus that's not something you necessarily want them to have (laughs) complete control over.