I just checked out both DigitalRiver shops (US Domestic and Europe), and the prices are as following:

For US citizens prices are :

Poser 6 Standalone = $239
Upgrade from Poser4/PP = $149
Upgrade from Poser 5 = $129

For Non-US citizens prices are :

Poser 6 Standalone = 219 = $292
Upgrade from Poser4/PP = 129 = $172
Upgrade from Poser 5 = 119 = $159

So the extra profit made by selling outside US is =

Poser 6 standalone = $73
Upgrade from Poser4/PP = $43
Upgrade from Poser 5 = $40

...given todays conversion rates.

These are just the costs for the product without any extra costs like shipping/import tax or VAT added, as these can vary for each country.

stahlratte