I'm bemused that anyone could think adding 3G would increase the price to consumers. The tech is already a few years old, infact most phones around the iPhone price tag have HSDPA! If anything 2.5G would be cheaper and 3G would cost the same as the iPhone does now. 3G is coming to make it competative in Europe, not as a price bumping feature.
If a 3G iPhone cost more in Europe nobody would spend a premium just to get a faster (which is standard in all phones in the iPhone price range) internet connection. It's having a hard enough time here as it is...
Yeh, but you forget, Apple always charges more for things that the rest of the world has had for years. And the fanboys are always happy to pay top dollar for it.