i didn't put in an extra zero
according to everywhere, 1 giga = 1000 mega
so 1500 giga x 1000 = 1500000 m/hash
and even if every kilowatt costs 1 dollar, which is a lot, you still get 2 million
Oh, I see what you mean.
Here's the real answer:
As you mine that quickly, difficulty will rise RAPIDLY. Not only that, but the BTC amount in each block will rapidly get smaller.
So if everything was completely stable, yes, you'd make 2 million dollars. But it's a situation of idealism vs. pragmatism. There are measures in place that would prevent 2 million from happening.
Trust me, I was considering buying a big BFL rig and mining, but I'm still hesitant because of how weird the BTC market is.
If you want to make good money, buy a BFL rig NOW. Like, right now. Get in early and you'll make stacks on deck.