[latch]

and there are more people in Europe than the USA - but that doesn't mean you ignore the US market.

Even if all things were equal, Nintendo portable is still a huge market. While the lines are blurring, I still think DS is a game device, and iOS isn't - specifically with respect to how much people pay/expect from games. The development costs for DS would be higher - as you'd have to build a longer game, but the so too would the margins.