im still confused with these people say mining is not profitable.

Half of my mining funds go to electric every month. The rest help pay back for equipment. Hold the btc you mine and sell it today the following year. On top of that you still have the equipment to sell off.

most companies are working in upgrade solutions for there equipment

also the network has reached a point where it will be very difficult to make another large network jump into the petahash range. i.e. bitcoin is more stable...

There are two things incorrect on bitcoin mining calculators. One is the difficulty assumption and two is the fixed coin price. Both of these are assumed variables.


variables