Is canvassing (going door-to-door to businesses) necessary? No, you can fill a card in many different ways; but canvassing is a great way to make money quick. Today in fact, you could go out and return with money in your pocket. Even if you don't choose to take on canvassing, if you're going to grow your 9x12 business and hire salespeople... you'd be nuts to not have them out doing it right?