Pain of posting it abroad, international postage insurance, international warranty etc.
I wouldnt sell anything to someone in Europe via auction... too much like hard work.
I think it isn't more work, since you probably have to ship it anyway. Items are insured automatically with most delivery companies. And if you're in a european country you won't be able to avoid european warranty laws. I sold stuff on ebay to international bidders (including UK) quite a few times, never had a problem. That actually is the cool thing about ebay and the EU.
Ok, I understand that you guys from that island sometimes don't like the idea that everybody has gotten so close, do you? :-D