A few days back when bitfinex hack happened, the price of bitcoins went down. I guess that was the best time to buy more bitcoins. Now the price is recovering quickly and its moving back to 650$.
Yes. There are still a lot of believers in it so they will buy and sell as it is very volatile. I wouldn't be a buyer now as no catalysts for it to rise
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although every one was thinking for investing money because they were sure that the price of bitcoin will increase again but still no one had courage to invest their money, and they just watched the price increasing and recover about 100USD in a short period of time.