That was an unmitigated disaster, a la Savings & Loans Crisis. Buyers/developers/sellers/loan officers shopped sycophant appraisers, and the tales of fraud and incompetence would fill a book. Texas, I hear, was especially bad. A number of appraisers went to prison. . . .
An appraisal is a government sanctioned document. An appraisal is predominately for use by government, e.g., courts, IRS, eminent domain authorities, and guarantee of our banking system (FDIC). Anyone can crunch numbers, but they are not granted the recognition to speak authoritatively to the government about real property value. {I've long felt that ordering of appraisals should be taken out of the hands of the lenders altogether.} . . . . . You or I could set up a tripod and measure-off a detailed map be it in crayon or autocad of a parcel of land. But not being a licensed surveyor, it would not be a "survey" -- just a nifty map.