What if a small group of people owned a big portion (e.g. 99%) of the land.
Would they sell it for cheap?
Would they keep it their property forever so that others can't buy land?
The small group of people can have acquired the land unjustly.
For example a prior government gave it to them excluding others.
The records can be lost so we can't prove any more that they acquired the land unjustly.