Ian,
I'm not sure it's greed; it's just business, legit added costs and, sometimes, bureacracy.
For instance, I make chairs in China (hence, my moniker). My best seller sells for US$19.99 in many retailers in the US and sells really well. In Canada, it sells for Cdn$34.99 and not so well. Part of this is becasue it's not the right product for Canada (seat height is 10" high in a country largely without beaches-they want a taller chair), but there are other reasons:
* 0% duty in US; 5.5% duty in Canada.
* We have to add US$0.50 more to the cost in Canada because we have to print bilingual (French-English) hangtags and becasue we have extra repaorting to Canadian Custos office regularly. More time and effort = more money needed.
* Exchange rate is 1.35 Cdn to US $.
Unfortunately for us, to Canadians, $20 is $20 and $35 is $35. They don't care that there are all these factors in the way..they want their chair for $20 - less if they can, but certainly not more.
In the case of (ATC) speakers, you have the additional cost of freight from the UK to the US with a commodity that is largely air (inside the speakers is mostly air). Now, all this may not obscure the fact that the importer runs an inefficient organization or are pigs, but it's a start in understanding the process of higher costs in other countries.