I don't know about that. Now that RE4 is multiplatform, sure, you don't need to buy a GameCube for it, but the game was IMMENSELY popular. The majority of gamers I know would probably pick it as their favorite GameCube game. I don't know if it moved a lot of machines since it didn't come very early on in the GameCube's lifespan, but practically everyone that had a GameCube bought it and enjoyed it every bit, if not more, than the Nintendo offerings.