It's also about georestictions. Geo restrictions prevent people from legally buying an eBook just because it's not published in the country you are in.
Forgive me if I'm wrong, but doesn't this have to do with a model inherited from the situation with hardcopy books? A writer can sell a novel to a US publisher and, depending on the contract negotiated, can sell the manuscript again to a UK publisher, then a European one, then an Australian one, each time negotiating a fresh advance on royalties. Sometimes a publisher will have a deal going with a sister publisher in another country. Because many, many books never earn out their advance, this is a way for authors to earn more $$$.
If a US eBook could be bought from
anywhere in the world, other publishers would be denied the opportunity to republish successful books in their own countries. Countries with bigger overheads and trickier markets would find it harder and harder to compete with US eBook publishers. Similarly, DVDs are region-coded, to protect the interests of countries that are simply unable to compete with the US entertainment juggernaut.
In Australia, in the 70s and early 80s, we had a publishing agreement with the UK, in an attempt to shore up our publishing industry (and the UK's) against US (much cheaper) prices for imported books. Australian book shops could only buy US-published books
if there was no intention of a UK version eventually coming out. So, for Aussie ST fans, most shops usually stocked the UK Corgi editions of James Blish and Alan Dean Foster ST books, but they
could legally import the Bantam ST Fotonovels (from one contracted distributor, Gordon & Gotch) because Corgi had passed on publishing UK editions of those titles.
Specialist shops started ruffling feathers by sneakily importing US ST titles in a more timely manner (supply and demand), but they could have been fined heavily if reported. The law was repealed in the mid 80s, once our governments (and the UK) were convinced that our economy could withstand an influx of cheaper US product.
These are still early days for eBooks, and to rush out a customer-friendly international model that may, in time, be realised as
extremely damaging to some countries' economies and/or writers and publishers, while unfairly benefiting other countries', is why we are seeing various models being trialled.
In big news Down Under last week, one of our biggest discount chains, Harvey Norman (furnishings, electricals), complained loudly that so many Aussies buying online from the USA in 2010 was denying the opportunity for our government collecting the GST (sales tax) on such goods. The parity of the $AUD with the US has caused an exponential jump in online sales and our local stores had a truly dreadful Christmas/New Year period. But Harvey Norman has received such an angry Twitter backlash from customers defending their right to buy online and save money, they've reluctantly dropped their campaign. In the long run, Australian stores will probably have less and less opportunity to compete/survive. We have high wages in this country, and Aussies may well face massive wage cuts and unemployment as the US online juggernaut continues to flourish.