+20.86% You gotta know when to pull the plug....
Turned off my miners this morning...until BTC goes back over $550. Need the fiat.
More bad news:
Estimated Next Difficulty: 28,023,615,809 (+17.53%) in 14 days.
Exactly why does the small difference in price matter so much? Are you instantly selling your coins? Then this wouldn't come as a surprise to me.
Why not keep mining all the time and sell it later if you have to?
I remember the days that I got into this business, the difficulty was 7M (!) or even less. It was quite some time ago.
If I only had a 4 TH/s ASIC then.

Many miners sell BTC to pay their electric bill and/or to purchase new mining gear. So of course a significant portion of earnings are immediately sold.
This maybe is one of the biggest problems right now, the big mines adding more and more MW, they must pay there electric bill also, selling more and more BTC for all the bills and a real profit, adding more MW next, and and...
Difficulty goes up, exchange rate goes down, in a few month the big mines like BF, cex, peta and some china mines will have the control over the most mined BTC's and the network.
This can be like a horror movie. The greed of the MW mines promises a dark future for Bitcoin - the worst scenario is a big, big crash... Just my two cents.