That's a very good point :). I will read the white paper in week or three or four weeks.

Though here's another thought. Hackers don't want to break BTC as then the price would go down and BTC and other Crypto Currencies (XMR) are great store of value.
If I was evil, I would steal 10 BTC and fucking retire. (Okay, maybe I'm not that evil if I'd just want 10 BTC :D)