Ziddina said,
So I suspect that they don't receive a significant amount from "worldly" people; it must be coming primarily from the already impoverished rank and file Jehovah's Witnesses...
I think in most cases you are right. I would occassionally get a small donation, but usually not. Regardless of donations, I believe the Society bills the congregations for the mags and other literature. (Someone correct me if I am wrong. Any literature servants here?)
Anyone can pick up their mags for free, but they still get paid for through congregation donations.
Then, any donation money received from the field also gets donated to the Society.
The Society gets paid coming and going.