Let's have a look at some numbers:
Today's Amazon.xy sale ranks for PHB3.5, english / local language
UK: 1,143 / -
US: 1,159 / -
CA: 3,798 / -
DE: 12,494 / 9,717
FR: 18,393 / 31,626
JP: 176,592 / 9,582
of course, these figures mean nothing :D . Unless you make the assumption that a) each...