Games which target iPad first inevitably make design and marketing compromises that harm their other platform performance & experience - whereas games which target other platforms then are adapted can typical make far less painful and less compromising changes (which can work against them or for them).
Yes, it is possible but not easy - look at for example Shenandaoh's Desert Fox / Battle of The Bulge).
But I don't know if that is a long term model for success. $19.99 is the highest price point you can set for a game and then you are competing with things like FMC2015 or Xcom (heck, you can get GTA San andreas for $6 or so - is your game better than GTA?!?) which are full PC ports. Clever developers will I think make a game for more established platforms, and if successful port to iPad for additional revenue.
The iPad has millions of active premium gamers, but a tiny number compared to any non-portable system.
Yes, it is possible but not easy - look at for example Shenandaoh's Desert Fox / Battle of The Bulge). But I don't know if that is a long term model for success. $19.99 is the highest price point you can set for a game and then you are competing with things like FMC2015 or Xcom (heck, you can get GTA San andreas for $6 or so - is your game better than GTA?!?) which are full PC ports. Clever developers will I think make a game for more established platforms, and if successful port to iPad for additional revenue. The iPad has millions of active premium gamers, but a tiny number compared to any non-portable system.