This is a touchy subject. We need to be careful to to look down on these folks. I prefer to think of them as "skinned and thrown about" and as "sheep without a shepherd," but that's just one ghost's opinion. I also like the Seneca quote in Besty's post below.
I've been in several English-speaking congregations in the USA over a few decades. During that time I have noticed very few baptisms resulting from cold-calls (the door to door work). A large majority of baptisms are children of Witnesses. Some are other family members of Witnesses (usually spouses, sometimes siblings, rarely parents). A small percentage come in via informal witnessing, and a handful come in from the cold-calling work.
I have noticed one trait across almost every Witness I know who came in from the field: lack of strong family ties. I don't know any Witnesses who came in from the field who have a close-knit family living in their community. In the rural USA, it is common for generations of family to live within a few miles of each other. Witnesses in these areas complain how difficult it is to get people to study and "make progress" when they have strong bonds with non-Witness family.
I have never seen folks in this situation become Witnesses. Rather, I have seen people who have moved into the community from another state become Witnesses. Also, folks who had a rough family life and do not feel strong ties to their parents have come into the religion.
Of course, all of the above is just my personal observation. The Pew report cited above gives a more complete picture of the Witness demographic in the USA.
