Worst refutation ever!
Shockingly bad refutation of the NS.
Accusing them of not understanding Economics, then showing that you understand it considerably less.
The sand analogy :
Sure, you're making chips, and as has already been pointed out - that takes vastly more power and resources to acheive than making bottles.
But its also ignoring the fact that people still need bottles, so someone else now has to make those, so ultimately there is MORE sand being used by your new endeavour.
And the singer one is even worse.
Unless it applies to singers performing in tiny rooms in little houses where no amplification is required, your new career needs power for your mic, pre-amps, mixing console, any effects (eq and compression are virtually ubiquitous, even in live performance) and the PA.
Oh, and lighting, advertising, transport, studio time.......
Utter rubbish. WP The Reg.