In the case of Williams-Sonoma, it may have been because an enormous amount of credit card fraud involves international use of stolen credit cards. Numbers stolen in the US are used in Europe and vise versa, usually to buy items which can be resold. Obviously this doesn't apply to ebooks, but it does to wedding presents.
Geographical restrictions on ebooks are just another vestige of publishers' unwillingness to step into the 21st century.
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