Lets face it, average people off the street are not the people who are becoming Witnesses. In the past, that is how a lot of our relatives became Witnesses and that is why we did all that door to door work, looking for more people like there was in the 1950's and 1960's. In this day and age, these are the people becoming Witnesses.
Children of Witness : They are raised in it, and unless they do something else as an adult, they are highly likely to do what they know in life and become a Witness.
Depressed, or mentally troubled people : People who just lost someone they care about, and are emotionally open to hope. They often burn out quickly though, as they will settle down and start realizing what a mistake they made. I don't know about others, but when I am in a highly emotional state, I am not 100% rational. However, Witnesses are trained to zoom in on widows.
Poor people in 3rd world nations : They will say or do what ever it takes to get out of the hell that is their life. Study this, puppet this comment, etc. What ever it takes.
Low educated people : I do not even buy a car, without researching the information on it. Anyone who blindly goes into a religion, in this information full society, is highly uneducated or one of the above categories.
That is pretty much it. I bet if you are someone who came in within 1980-now, you fall in one of these categories. I don't run across a lot of people saying, "because god moved me too" or because they found me in the field, to much in that time frame. Would you agree?