Well if I'm a miner too I will also shut down my rigs, why?

First of all as you can see the market and the Bitcoins price it's dropping nonstop. You have invested to buy equipments, paying electricity and maintenance of the equipment just to mine a coin that the price is dropping isn't? Let's say you pay for electricity as well as the equipment for $1000 and you're going to sell the Bitcoin you've mined just for 300$.