No block in 3 hour ?
Cloud people left when difficulty went to 214G
Whoever this is: STOP THAT!
I bet you it's a GPU miner.
Why? There are people who can launch thousands of instances on Amazon for a hour....
And how much do they pay each time they do that?
You only have to buy graphics cards once.
Thing is, a GPU miner would likely be extremely profitable to keep running, even at a high difficulty. However, you'll notice that, upon crossing the point where each coin mined on EC2 would cost more than it would sell for at the exchange, the hash rate drops off extremely quickly.