Funny no one has cited Randals What-If yet: https://what-if.xkcd.com/23/ https://what-if.xkcd.com/23/ (third question on the list) Back of the envelop calculat

Funny no one has cited Randals What-If yet: https://what-if.xkcd.com/23/ https://what-if.xkcd.com/23/ (third question on the list) Back of the envelop calculations would have break even after about 100 years...