As a hashflare user, I have serious doubts regarding hashflare profitability. At the current exchange rate (about $11k/BTC), difficulty (about 2.6 trillion), and contract cost ($220 s/TH), a 1 TH/s contract yields less than $1 per day. It will take over nine months to recover the cost of the contract, and that's if nothing changes. The last several difficulty increases have failed to restore the block solution time to the nominal 10-minute level. Total hashing power in the network continues to increase despite declining profitability parameters. This suggests to me a near certainty of further significant difficulty increases over the next weeks and months. As a result, I think hashflare contracts bought today have a high likelihood of expiring before they pay for themselves. Therefore, I have suspended reinvesting, and am holding my hashflare mined bitcoin pending improvement in the market conditions or reduction in hashflare contract price.