Who is Lu Bauer and Steve Brandon from Your Money or Your Life and what is their importance?

Lu and Steve are a couple from Maine. Lu is an accountant. Steve is a truck driver. The authors use Lu and Steve's monthly tabulation form as an example of one way to set up categories. The couple sells their second car to reduce expenses, and after Lu figures out that she only nets $5 per hour of the $60 she charges..... she raises her rates.