Thanks for all the replys guys , enjoyed reading them.
Valid points of view presented here but we still have to take into consideration that not every miner is a big farm , and not every miner lives in the same country with same electricity costs.
I just gave you my example , wich would have been in my case ,
For me personally one bitcoin would cost over 400$ to produce here in my country with a neptune wich still is one of the best miners on the market.
but a neptune is no where near as efficient as one s7, you should sell that neptune and buy one s7, your cost to produce 1 coin will reduce greatly