The price you see on US store do not include local taxes(which US citizen do pay when they make a purchase).
In Europe the price already include VAT, if you esclude this tax you'll get more similar price.
I do have relatives, friends and business partners in US, you know? If i go and purchase from B&H photo and i live in, let's say Florida, do i pay sales taxes? I guess not.... Even if you exclude taxes the price in EU it's still waaaay over that in US. I think it's just plain greed from Apple, more and more so. Lock down computers, increase prices to ridiculous amounts for a quad core, no user access to RAM, hard and video and so on. HP, Dell and Lenovo are all selling in EU and their prices are much more close to those from US. Why is it only with Apple that it's not possible?