Renovating NYC carries an wonderful article by rjdiaz, Should You Use An Architect, A Designer, or Do It Yourself?
Interior designer Gail Green writes, "While previously relying on a professional’s expertise, client’s are now, for the most part, calling the shots. Design is motivated by the client’s desire to get the best possible price without realizing the inherent cost to them. Inherent because cost is not just comprised of the dollars spent, but something much more valuable: talent and expertise."
The article is filled with numerous examples of a fool and his money are soon parted. Great ammunition to convince your next prospective client.