I don't think that most serious pirates (those that actively seek pirated games) would be frequent buyers of any game to start. That's why it's a stretch to say that SE:IV's sales would be higher.
*begin not-so-subliminal message to pirates
Of course, those that have pirated SE:IV and played it for any extent have all since felt (or starting to feel) very, very, guilty for having done so and have bought (will purchase) legimate copies.
*end not-so-subliminal message to pirates
[ March 25, 2004, 19:53: Message edited by: Captain Kwok ]