Well it started as a wealth symbol because the amount of energy, labor, and money it took to maintain a pure grass lawn was immense. No one ever saw a well manicured, pure grass lawn outside of mansions and palatial estates and such.
Then we got push mowers and fertilizer and weed killer and sprinklers - everyone could have their own green carpet!
But yeah, fuck lawns. Might as well just roll out AstroTurf.