Whatever the suckers will pay ....
Most US companies discount when they hit Developing countries or China be it software or hardware - in fact it seems that 'piracy' or copying is even more profitable as some companies will actually swap out your 'hot' software for a copy of the real product for either nothing or a very small fee.
The EU seems to be very gullible when it comes to comparing US pricing, mind you the fact that VAT is included makes calculations a little harder. Tax should always be shown separately so help consumers compare prices. Apple has always been a prime example of ripping people off, then selling extended warranties even in countries where the mandated warranty is two years.