You are dealing with something that has no useful value other than speculators and miners trying to get money out of it.
No useful value.... I disagree strongly. In fact, I can think of very few things which are more useful than Bitcoin.
How is bitcoin any more useful than I0Coin? It isn't. Except I0Coin is worth $0 and bitcoin isn't just yet.
it's more useful because it's accepted at more places and by more people than i0coin.
Canadian Tire money is accepted at more places than Bitcoin, so that's not a valid argument at all. Bitcoin doesn't have a fundamental value, and isn't directly convertible in the current state of things. That means its minimal value is just slightly below zero.
Once Bitcoin becomes useful, I'd think it will go up again. Until them, I'm enjoying shorting them.