Land records are valuable for genealogical research. They provide evidence of places where your ancestor lived and for how long, when he or she moved into or out of a locality.
This has occurred in my own family search. I learned that my Great-great grandfather (on paternal side) purchased land in Wisconsin, the year, and the county/state of residence he lived all in the grantee deed. This helped me to trace his migration pattern backward and determine some years of where he lived or stayed that I was not sure about.