It means nothing. It increases and decreases for small amounts. If you have Bitcoins, I would say sell them now and get some small profit in case you bought them for less than $240.
What if the price does not come down below $240?
It's not "what if" because it will most likely will never get back to that amount , I know we can't really predict otherwise we would be all rich but there is some factors and I guess greece is one of those factors even if i don't understand why it started now while their problem started days ago