Indeed, if the price fall back to the point of 100$ per 1 bitcoin, that would be a good investment. Because the potential of this currency in a current period really unpredictable, but if it goes down even to 300$, I should say it's still improbably really profit investment
don't do it , it's would just hurt you for long time. i have been waiting for long time enough just to see the bitcoin price dropped to $600 or so but now i'm suffering , i have sold the whole bitcoin i have on $800 to $950 and now i'm struggle to set my buy position 
. should i buy right now at $1,200 before the price skyrocketed? or waiting for another flash drop? i really tired and hope you didn't follow my decision .Bitcoin is going as per my expectations on the price chart and I see further appreciation up to $1,300 in this year but at the same time we might also see some lower levels of $700 in this year and it will be the year of price fluctuations. There will be sustainable growth in the price of bitcoin since the end of the year or the beginning of next year IMO. There will be enough enter and exit chances during these price fluctuations.