Suppose the minimum amount to make this make sense is worth 1 cent over 4 seconds of running the proof of work. Then this proof of work would earn 24 hours/day

Suppose the minimum amount to make this make sense is worth 1 cent over 4 seconds of running the proof of work. Then this proof of work would earn 24 hours/day * 60 minutes/hour * 60 seconds/minute / 4 cents/second / 100 cents/dollar = $216/day. But any proof of work system that can earn $216/day would make far more sense to run dedicated miners for instead of running miscellaneous computers on.