This article contrasts the work done by Fair Assessments, LLC vs. Appraisers. During the recent real estate depression (some might say ongoing) many people saw that there was money to be made in property tax reduction work and got into the business. Many of the people/companies that have gotten into this work are real estate appraisers. Some people might think that this is a natural extension of what appraisers already do for a living. They might be wrong.
The appraisal business has changed a lot since I did this work twenty years ago. The government, in the name of protecting federally insured institutions and the public, has (unintentionally) driven down the price of a real estate appraisal. There are a handfull of large companies that make software for appraisers, and some of them saw a way to make more money by providing marketing services to appraisers. One that I am aware of, a la mode inc., pushes it's print and email marketing software to appraisers that "will proactively help you get new clients that pay higher fees."