This is pretty much why in Asia and Europe people dont have large families, nor large dogs, nor buy massive boxes of goods from warehouse stores. National parks you should be good.
The thought processes is more like: we are not willing to have more than (1-3) children because doing so will have costs that will lower our quality of life. That includes expenses of all kinds including cars, but opportunity costs are probably more dominate than financial costs. At some point people just don't value larger families, but there certainly is some marginal consideration where people want a larger family but don't find the tradeoffs worthwhile.