First impressions can set the tone of a relationship. If you met a stranger interested in what your business has to offer, would you just blurt out your name and number and walk away? Would you hand them a business card that's dog-eared on the edges and has your dirty fingerprints on it? Would you expect them to contact you if the phone number or email address on your card was wrong?
A properly produced website can create a professional "first impression" for your business.