The one scary part is that they obviously take notes. When they come now, they use my name, my wife's name, the kids' names, all without being told them. They remember other stuff, too, since I don't really say much, I just listen and answer yes or no and thank you.
It's a little offputting that they know so much without ever having been invited inside.
And they clearly don't just canvass the block, because they pull up to my house in a car and then get back in the car when they're done.