And that's the reason I think they don't allow 'Retina' Res iPhone on the iPad. So they can let developers make more money charging us 'more' or twice for an application that doesnt look like ******
As a developer, I can perhaps chime in. It's actually quite a hassle to keep iPhone and iPad versions of your app. It would be very nice if an app which supported retina would automatically display in that resolution on the iPad. I decided to make a universal app out of my existing game to give iPad users a better experience. I can share some of my thinking: On the one hand, the fact that for a while on the iPad the "race to the bottom" seemed less pronounced, and apps were selling for a little bit more than their iPhone equivalent. I would have loved to differentiate, and have a "universal" app for, say, $1.99 and an iPhone-only app for $0.99. If only to see which percentage of sales went to iPad and which to iPhone/iPod. On the other hand, this would mean that my existing users (all iPhone/iPod) who also happened to have iPads, would have to purchase my app again. I decided that would be really unfair, so I just forgot about that discrimination.
I find it rather frustrating sometimes that when I buy an app for my iPad, I have to re-purchase the iPhone version of that app. Even though it's just a few dollars, I notice I have this mental block that feels like I'm paying twice for the same thing.