I assume they get most of it from cash donations and assets left in wills. There may also be some income from invested assets. I guess they get a lot of money from old JWs who die childless or with only df'd kids.
Geographically I assume they get it mostly from a few countries that have many publishers and strong economies. They recently published their top 6 publisher countries:
I am sure the US makes up 50% of their income. Mexico, Brazil, and Nigeria are almost surely money losers, maybe even money pits. I don't think the Italians earn much profit, if any. I'll bet that Japan is number two in profits, with their super branch. I guess Germany is next with their super branch. I think the UK and and Canada turn sizable profits. Australia was profitable, even with their small population, at least until ARC.
Here is my guess about profits:
1) US 50%
2) Japan 18%
3) Germany 16%
4) UK (known to the stupid Borg as Britain) 10%
5) Canada 6%
My impression is that the rest of the world either breaks even or loses money for the Borg. The case of India, which I read about here, is a funny case where the India branch has to beg Indian expats to donate from overseas, with copies of their passports.
What are your thoughts? I hope I have not exposed my poor accounting skills. Please take easy on me, since this is my first post of intended substance. I hope awake people in these rich countries can help dry up the funds to this lousy "charity".