> which makes the cost per attack $0.003. on the other hand, the PoW is much lower. If your attacker isn't even paying for the resources they use, such as from

> which makes the cost per attack $0.003. on the other hand, the PoW is much lower. If your attacker isn't even paying for the resources they use, such as from botnets or borrowed, then your attack value has gone out of the window. If the indivdual attack is free to the attacker, then you're left with time. PoW guarantees a time value. If a single PoW is too cheap, then ask for more values.