The EU price includes the warranty, which is at least 2 years but is officially for "the expected life of the product", which in the case of an $10,000 laptop would probably be a decade plus.

You can get AppleCare+ in the U.S. for $149/year which is just as good (or better) than any warranty.

Do you really think the warranty justifies that price differential? A warranty only protects against manufacturers defects.