It is my obwervatoin that as houses approach 325m2 people start looking for more luxury in the space vs more. Beyond that more space isn't needed unless you are rich enough to win the cities largest mansion competition and so people who are rich but not rich enough to compete don't go bigger even though they could.

Live in a pup tent and you want a bigger one, but in a bigger tent you start thinking lights or a cot before bigger.

there is of course a lot of variation. you can be happy in anything - but you will want more anyway until you get to about 325