I've had 10 jobs for a 1000 leaflets once or twice over the last 8 years, sometimes you hit a good area, I did it by visiting small villages which never get targeted by leaflet companies because they are too small to bother with.
but its impossible to consistently get that result with general leaflet delivery, OK if you knock on the door and give them the leaflet you might get that result., if you could then don't bother carpet cleaning any more, people will pay big money for a 1% response leaflet.
Mike