Think about it. The web now days is all about being personal. Taking the time to talk to your clients, help them with problems, even give them tips and ideas about a product or service when they don't ask for it. Email campaigns have been built around it, newsletter, etc. All focus on talking to clients and showing them that there is a team of people behind the site and not just pages and pages of code.
But what about actual customer service? Taking the opportunity to help a client when they have problems etc. ? I was reading through another forum a few minutes ago where they had a poll about who uses customer support for their companies or not.
Seriously , if your client base is kept happy, making sure an problems they have are sorted out quickly, in a friendly matter, it shows them that you care and that their customer satisfaction is important to you. That leads to them bragging about the awesome service they received from company such and such, which could lead to you gaining more business and more sales.
Would you agree?