Because of low density. If a three person family lives on a 1000sqm plot of land rather than say 300 or 3000 in a skyscraper on the same plot, you inevitably ha

Because of low density. If a three person family lives on a 1000sqm plot of land rather than say 300 or 3000 in a skyscraper on the same plot, you inevitably have a harder time providing essential services. Hence the need to drive, built large parking lots, etc.