Pretty much every time a contractor does something to any of my neighbors homes, they knock on my door and say "2 or 3 other neighbors are doing X (pesticides,

Pretty much every time a contractor does something to any of my neighbors homes, they knock on my door and say "2 or 3 other neighbors are doing X (pesticides, windows, landscaping, new water heater, power washer, etc. etc). Your home was built around the same time as theirs. Because all of my crew is already in the area on (date) I'm offering half off if you agree to service". The fact is that these contractors really do have significant efficiency gains if they can get multiple neighbors to agree to similar work. So it behooves them to do at least a bit of door knocking.