Because of it is a virtual currency so, faith is the most important factor and we must put our faith before investment because without it we can not make an effective investment.
Bitcoin is a volatile currency so fluctuations in its price is not a big deal or new thing. Its decentralised nature is the main reason behind its falling price because of this their is increase in irregularities in its production and distribution. Many big multinational companies like Microsoft, amazon, greenman gaming, alibaba etcstart investing in bitcoin. So their is sure possibility that in near future its price will be increase. And i think the time is perfect for buy bitcoin because its price is down and sell in future when its price will increase.