[rickydroll]

$100 worth of work is not the same as solving $100 of proof of work puzzles. $100 worth of work produces some value to the local community in that you deliver goods or services that somebody else wants. A proof-of-work puzzle takes a resource (electricity/compute cycles), and destroys it. IMO, Proof of work puzzles are only useful as rate limiters. POW doesn't create value like chemical processes producing pharmaceuticals, or smelting iron ore producing steel.

[nodoll]

When I said "Work" I didn't mean POW puzzle solving.

But solving PoW puzzle to mine bitcoin is also useful work in the sense that it adds one coin to the economy, which is why miners are rewarded for it.