Perversely, I'll side with the albeit snidely described "elitism" angle. Most people in a position to actually write a mobile device app which has a shot at making real money have probably come from a social strata demanding a higher standard of living. A university degree or two, more than a few Apple products and other non-trailing-edge technologies, a voracious appetite for information & tools, and a vehicle which they're not spending copious time personally maintaining (to mention a few). While I'll usually argue fiercely that one can live well & productively on a pittance, normalcy is someone making a net $70K probably will be looking for at least a secondary occupation.

And note that the parent post referred to net income, implying a >$100K gross. Your retort indicates a gross $70K or $53K income. Let's keep the comparisons on par.