Let me ask you a question: do you think it is easier to sell your product or services to a complete stranger or to a person you have had contact before; whether it's an email conversation, forum participation or even an existing customer relationship (i.e. He has bought something from you). Without doubt, it would be harder to sell to a total stranger who does not know whether or not you are an honest seller, and whether or not they should trust your words and believe that your product or services...