Business Card is a great tool for marketing your company on events or meetings with clients. It´s a way for the clients to always carry you with them and it´s easy for them to just call or email you since they have all you contact info on the Business Card.
Now I want you to think, when did you last time save a Business Card that you recived from someone? Good! Now, why did you save it? Probably becuase you were intressted in the company from the start? Or maybe becuase it had a nice design and was a intressting Business Card that was wurth saving for later. You get the idea?