Yeah, true. We are looking into l10n and I18n. Right now just under 50% of our users are from the US. There is a seeming correlation between high conversion rates and english speaking countries and this would confirm your point.

In order of highest conversion rates are: New Zealand (1.16%), United States (0.98%), Brazil, Australia, Ireland , UK (all around (0.79%), Singapore, South Africa (around 0.6%) then it levels out.