What do you mean by "just disappear"? People lose it, but because they lose the keys or passwords. It's not like the protocol causes it to poof away out of nowhere. It's entirely user error, and not terribly hard errors to avoid at that.
I meant bitcoins stolen by hackers - in digital world where is practically no anonymity..
..and what about that idea, where you buy HW with graphics card and you can earn bitcoins? It sounds so simple and unbelievable imho. That's why I am curious.
