Leaflets simply don't work. Or don't work any where near peoples expectations. Knocking doors when you can , chatting to them, explain what you're about, let them know what sort of areas you're in, have a laugh with them and ask them if you can take them on as a regular customer.
Leaflet drops will get ignored. well the majority anyway....
even that fella that dropped 50,000 and got 120. if you knocked 50,000 doors i would certainly expect to get a decent amount more than 120... (not a personal dig, just an example)