Well the Euro brings it's own headaches. Just look at Greece.
Also, the Euro currently has some notable big European countries excluded: UK, Switzerland, Norway, Sweden and Denmark. These countries alone had a combined GDP of almost $4trillion in 2010:
"Even just supporting the Euro zone will already be good progress, as it covers most of the wealth in Europe."
The point I was making was that even if Stripe supported the Eurozone countries, that could have it's own problems too. That probably wasn't too clear. The Euro could well slide massively in value versus the dollar which could impact Stripe's expansion to Europe, as there is huge uncertainty about the Euro here at the moment. I mean would you look forward to expanding to a region whose currency could actually collapse?
Also, the Euro currently has some notable big European countries excluded: UK, Switzerland, Norway, Sweden and Denmark. These countries alone had a combined GDP of almost $4trillion in 2010:
http://www.wolframalpha.com/input/?i=gdp+uk+%2B+gdp+switzerl...
And that doesn't even account for eastern European countries.