The problem is that to set up a service like that would cost money and... you'd end up having to pay to use it, so you're back at square one.
I hope they will get this right without a hack in the future.
You can check this by going to the same kindle page with an account with a US-based address, or a proxy in the US. For example, here are the prices for two ebooks, one from .nl and one through an anonymous proxy:
As you can see, one of the books is more than twice as expensive from Europe. The same happens with all books in the Kindle store, as far as I know.
I think sometimes it's not that people are cheap, it's just that the internet's been out for almost 20 years and these legal barriers that screw the customer don't need to exist.
Say what you like about bittorrent, at least it's egalitarian.
(E.g. your example book shows up as $4.03 from Switzerland).
I have been buying books from the American kindle store and paying using a non-US credit card and it works just fine, have been doing so for over a year.