My take?
1.) They get in their hours.
2.) If the occasional lonely old senile senior citizen or mentally incompetent person DOES happen to show some interest, while then "Jehovah must have drawn them near."
That is what they think anyway, that Jehovah draws those near whom He chooses, so it doesn't matter how little the R&F do, or how many people pass by, it's all on Jehovah. Which begs the question: With Jehovah being able to read hearts and judge, and with Him drawing those near whom He chooses, why even bother with the field ministry in the first place? Seems like a huge waste of time. Oh wait, I forgot.......It's a cult!