The idea of expecting to pay $10-$30 for each mobile app, whatever generation you come from, is ludricrous. Certainly there may be some at that price point and beyond, navigation software for example, but they'd be few and far between.

The market will ultimately determine the future of the Ovi app store. If the average cost of an app is £3 then that's too high imo, the existing app market shows, again imo, that the apps that sell are the low cost, throw away type apps. Even if my device costs $500, it doesnt affect my purchase decision for every app I want to run on it. A bit of software or a game at £1 a download is not a big deal, if we dont like it we're not that bothered. When it hits £3,£5,+ you reach a pyschological point when it actually becomes a purchasing decision. At the moment Angry Birds doesn't have anything to compete against for our money, but it may do so soon. (though I don't think there will be much of an influx of games heading to the n900 anytime soon..)

Edit: In regards to n900 apps vs iphone prices, there's just so much more available on the iphone app store that software needs to be priced much more competitively. I am unsure how carrier costs etc paid to Nokia compare to Apple, if that affects the final price too.