Element of surprise helps manipulate some people. Potentially - if the consumer does not hang up in disgust. Element of surprise helps manipulate some people. Glossy brochures and lots of printed content can be persuasive, but manipulative for only some people. Where outbound telemarketing is cost effective, it is because it is effective with certain people.
Direct mail is cheaper and better for a wider range of people.
Address must be known. People can be targeted any time, at home or work, when they are there, via answering machine or via mobile phone. Fax can be sent any time. Fax number must be known, and many consumers do not have a fax. Early days yet.