It's higher than one percent, but we don't publicize those numbers. It's hard to compute the difference in ratio internationally vs. domestically because we only have the optional user specified location field to go off of.
Any anecdotal guesses from your drinkup experiences? Perhaps reworded, do you feel people are more or less willing to pay for SaaS domestically/internationally?
Yes, I've met all kinds of people while travelling that pay for GitHub accounts.
I'm always surprised at how many people have heard of GitHub in other countries. I think it shows how successful virality can be. We plant the seeds of GitHub usage in foreign countries through conference talks and drinkups, and the people that attend become patient zeros for the spread of Git/GitHub in those locales.