We also have a few from Latin America, Eastern Europe and Mauritius, where this is also a very good salary.
We weren't looking specifically in those countries nor are we limiting ourselves, but it simply happened that we found people through contacts in our personal networks.
I also noticed that you bonus folks based on pro-activity and other measures, which presumably plays a pretty big role in the decision-making process?
That said, we've noticed that many people care much more about the freedom and flexibility we over, rather than having a huge salary, as long as the base salary is fair.
With the bonus we want to encourage everyone to think and act like a co-founder. Take responsibility and action where needed instead of just ignoring problems until the shit hits the fan.
We also had cases where potential clients decided to go with a cheaper option and then came back to us to "rescue" the project.
In the end the price itself doesn't say too much. More important is the value you get for that price and that is different for every agency. There are things like quality, being pro-activity and recommending the right things to do (not those that make the agency the most money), experience beyond pure design & development (e.g. marketing apps, getting featured, high App Store ratings and reviews, etc.)