you're also skipping the part where they're just buying the LAND. she's keeping her house.
And you are missing the parts where the land is actually worth more than she was paid for it, it costs a lot of money to move a house, houses always sustain damage when moved, the land it moves to also has to be bought, and the new lot is a less desirable location.
Perhaps you are one of those people who can only learn from their own experiences. If so, may you have a chance to learn about this yourself, someday.