Electricity price is what determines profitability. Hydro-Quebec holds one of the cheapest rates available in the world.
As difficulty builds up, more powerful ASIC miners are needed to compensate for the difficulty. Our custom ASIC programmation extends life of all miners by at least a full year.
Once upon a time an Antminer S9 was costing more than 1000$. Today we can buy them for under 150$
Up and downs are hard to predict. A good management of crypto-currencies is necessary to mitigate loses.