To be honest, I think you could even reap the benefits of arbitraging hash difficulty. Eg. just as a new difficulty level is set, flood the network with additio

To be honest, I think you could even reap the benefits of arbitraging hash difficulty. Eg. just as a new difficulty level is set, flood the network with additional nodes and hash away till the next difficulty update. Then kill the nodes, and wait for difficulty to adjust up and then back down, and then attack again.