This is something that is often overlooked by service providers because they're so busy working on providing a great service that they sometimes forget about the relationship building part.
Being a virtual assistant means getting to work with great small businesses and solo entrepreneurs; you can provide more detailed customer service, give one-on-one attention, and focus on specific aspects of business. But you still need to connect with your clients on a personal level to build strong client-provider relationships.
(full blog post, transcript, and podcast episode at http://www.vahelper.com/1872/supporting-clients-beyond-services-to-build-and-strengthen-relationships)