As a childless American with 3 cars, 1 motorcycle, and 3 bicycles... I must say that plenty of folks would find your "don't have kids" comment equally bizarre.

And on the flipside, cars are cheaper than kids :)

My reading of the GP's comment was that those were not suggestions, but a mere observation, where out of many possible and viable alternatives, one is utterly dominant to the point where the others aren't generally considered as alternatives anymore.