The point is that it's a problem when people who were born and raised in an area can't buy there
This can happen due to
1. land monopolists/collusioninsts, and
2. new economic opportunities in an area for certain kinds of people.
The first is surely a problem - morally, as per free-market-principles, and as far as collusion is illegal, it is a problem legally too.
But second? Why deny certain kinds of people have opportunities in an area, access to that area just because they were not "born and raised" there ? Many great innovations in history have happened by people away from their homelands. This is because of 3 reasons :
A. People motivated enough to move away are likely to be motivated enough to work harder to succeed.
B. 100 talented people living in density of 1 per 500 square miles are much less likely to produce lasting value than those same 100 talented people working together. Teams of great people are more than the sum of their parts. Which means moving their asses to where the good people and opportunities are, for the benefit of themselves and society at large.
C. People away from their homelands MUST work hard. Often there is no family to fall back on.