may be your mining operation is costly, but some people are getting cheaper power and their mining cost is lower than yours, so, you may be unable to sale, but current price is still profitable for some - so, trade and sale will continue.
You fail to understand the power of exponential numbers. ROI of mining BTC is diminishning exponentially.
and the fact that he is now down it's just temporary and he soon attains its former peak price))) so now just have to wait the best time)))