DX was a typo and has now been corrected.
As far as price goes, European pricing includes VAT, while US and Canadian prices do not. The US does not have a Federal sales tax but does have state taxes. Canada has both. There still is a price differential, but it's not as great as it seems.
The reality though is that if someone in Europe wants to buy high-end photo gear and is willing to bring it home without declaring it to customs, one can usually fly to New York, have a pleasant weekend vacation, see the sites, a show, have a couple of good meals, and do so for less than the cost of the price differential on about a $5,000 gear purchase.
This differential between US and rest-of-world pricing has been a real thorn in the side of Canadians for decades. Recently with the US dollar devaluing to par or below against the Canadian dollar even math challenged Canadians are able to see at a glance how much they're paying for goods (like cars) that are substantially more than just a few miles away in the US. As a consequence many Canadian importers, distributors, and retailers have lowered their prices. The auto industry is of note. Epson, for example, set their US and Canadian prices at par last year.
Michael