...is not going to encourage me to pay for his services?
That is just what I have encountered: a man in a pinny (and clothes!) with a huge scissor sharpener and a knife to 'show me how he could sharpen my utensils.' He wanted to COME INTO MY HOUSE and show me just what he could do. We have had a spate of people offering various things - from windowcleaning to roofing - but this made my mouth drop open.