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As long as the crypto values are skyrocketting, is it interesting.
If the value is going down, you are right our returns will become lesser and lesser every day.
It is a fact that it is a risk to invest.
Have a nice day.

Yes exactly what @dimitrya123 said as long as the price goes up and remains same or more than difficulty you will always make a nice profit. BTC, ETH, LTC, DASH are all going to go up X2- X4 fold in 12months time. We are in a digital Gold Rush boom. Enjoy it now it's a special time in history.