A little while ago, my wife was pestered at our front door by some downy-cheeked sprog of a salesman. I think he was attempting to persuade her to switch to a different electricity supplier, but whatever the product, she wasn't interested and said so. As is so often the case in these situations, the sales-twit semed to have trouble realising this, though I suspect that the firmly slammed door probably put the message across.
Why do we have to put up with this?
There's a mail preference service which can stop you from being deluged with junk mail and it works pretty well. There's also an equivalent telephone service, which too is very successful. Can I then propose a "doorstep preference scheme" whereby you could indicate whether or not you wished to be plagued by spotty little herberts trying to sell you stuff that you don't want?
I'd sign up like a shot!