Why someone should do one? Bitcoin is just a two billion or so dollar economy at most, that is literally nothing. I suppose your simple-simon newbie-ish logic can't understand that.
Ah, so your defense is that the BTC-economy is
"trivial" in size. How well does that match, I wonder, with the fact that any
non-sovereign system is
always a potential threat to an existing power structure?
Doesn't it make more sense to strike now before it gets more hashing power added? That is, if they understand the full implications of a global non-government controlled monetary system.
Also, your claim of
"some millions" is off by a considerable amount. Reference:
https://www.resallex.com/bitcoin/brix1)It is very very unlikely bitcoin will become a real threat for them. So far it is still just a two billion or so dollar economy and nothing more
2)Current network hashrate is almost 700TH/s. By buying, for example, the new BFL mining ASIC, the Monarch, you would need to spend 5.460.000 dollars for a 51% attack. Less than 6 millions. I suppose that the link you posted is still based on GPU mining.
Sure, hashrate is skyrocketing, soon it will reach 1000TH/s and it will probably double and grow even more. So, sure, you will have to spend more, but the cost is still nothing for someone that can spend billions like nothing. How many dollars does USA print every month? Dozens of billions? 1 billion is 1000 million. More than enough to attack bitcoin whenever they want.
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? Imagine buying at 20 and selling now, so much profit 
