Humanity spends about $6 Trillion on energy annually, so 1% is no small figure [1]. Is a proper crypto-currency worth $60BN in maintenance costs per year? No idea, but it's likely to be more expensive than the alternative of traditional fiat currency. For reference, the federal reserve produces about $70BN in interest fees for taxpayers each year [2].

[1] https://en.wikipedia.org/wiki/World_energy_consumption [2] https://www.thedailybeast.com/the-insanely-profitable-federa...