Wow, I didn't even know they still did door-to-door vacuum sales. The business card suggestion was a good one, but I'm pretty sure I wouldn't let a stranger in my house anyway.
I WOULD, however, let a kid shovel the snow from my driveway without a permit if I didn't already have a handful of sons to take care of it in exchange for the wifi password.
It seemed strange to us that he was asking us to sign up for a demo. A better-dressed guy with a "sample/kit bag" and a vacuum cleaner may have had a bit more chance to get in.
Back in '83, after I came home from overseas, I did a stint for a few weeks as a vacuum cleaner salesman. Not door to door. It was by appointments. A gig my BIL was into. I think they still make them. The business model was a pyramid (scheme). "We' offered a free gift for a demo. 99% of the targets only wanted the free gift.
I will say the product was "worth" it. As far as suction strength and durability. Of the actual vacuum. But a $1300 vacuum in 1983 was a bit too much. FWIW, we still have one, 35 years later. The powerhead went out years ago, then a couple of other features. We use it for spot cleaning and our cars. Sucking cobwebs out of corners. Not that I am implying my life doesn't keep a clean house. She is a clean freak. But I wonder, sometimes. Where in the hell do those cobwebs come from?
My mom had her Electrolux for decades.