This is my least favorite page to encounter when browsing for a book.
This page conveys the message that the book is not available for sale in the US, at least not through the major distribution channels, but it is available elsewhere in the world (in this case the UK). Delay international release — whether because of protracted subsidiary rights negotiation, deliberate waiting to resolve market size uncertainties, or whatever else — seems to serve to keep readers from becoming aware of the books (because of the lack of corporate marketing in the foreign regions) rather keep books out of determined hands. For determined consumers have recourse to both piracy and a ready supply of foreign resellers to meet their demand.
The only parties clearly hurt by the staggered book release dates are big foreign retailers (Amazon, Barnes and Noble, independent bookstores) as the merchandise is kept out of their hands but not anybody else’s. Are losses due to the frictions of international publishing usually compensated for by increased profitability accrued to the authors?