> Paying for things is a fair exchange.
Only if you have money. No, it's not fair that someone with more money can take over land, it's the market and the way the world is but it's not fair. The only way this would be fair is if everyone started from the exact same spot in regards to resources: money, education, intelligence, etc. which isn't realistic at all.
And someone buying a property could easily be the beginning of new generations of people who will have long history there. Do they not deserve a chance too?
Paying for things is a fair exchange.