Yes that was the profit in 2016 and 2017 will see a bigger rise in value.
Yes the price of bitcoin goes up and down,some people will stay away from cryptocurrnecy for that reason. However over a period off time the value will go up.
At this moment in time Bitcoin is said to be the currency of investors and traders; imagine what will happen once the general public really gets aware of this and starts using it on a daily basis!

Any entrepeneur should really be looking into this and learn ways to make a profit from this!
There are different ways to take advantage of cryptocurrencies:
Buying
Mining
Trading

The beauty is that anyone can do these,you just need a little knowledge to start
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