@Saiangeli actually, this is probably one of the more reasonable plot points; as tech improves and so does basic necessities, eventually population just rises [esp. if no anti-poverty measures are taken] and real estate price goes up
as productivity/meter square improves, land becomes more and more valuable even if the population stays the same regardless, as people [read, VCs] can afford to pay more for land [increasing demand] and still profit off said land
anyways, skyrocketing prices for prime planetary real estate is actually fairly reasonable and less-than-cliche
notably, something something detached house =/= condo which means it absorbs large amounts of potential real estate for just a bit of luxury, this is stupid expensive [if you've ever lived in or have friends who live in a big city, you've probably learned how stupidly expensive it is to even try making a suburb house in a city center]
our current population is in single-digit billions, and a suburb house can easily rack up $1 million in a big city center
now ramp it up to single digit trillions, hundreds of millions for a house on planetary [which is practically prime real estate in terms of luxury] and detatched wholly from everything else [increasing real estate usage per house] is actually reasonable