I am never bothered by door-to-door sales people... mainly because I never answer my door. They even see me sat on my couch through the window when they come to the door. I still ignore them.
When I did my own stint doing door to door sales, we called people like that "Ninjas" - we knew someone was inside, pretending not be home - although in your case it would be a little different - maybe like a "Bad Ninja" xD