Most recently, Bitcoin mining on hashflare became unprofitable and this has led to a lot of questions. Meanwhile, for the sake of newbies in the house, What is maintenance fee? The maintenance fee covers all costs related to mining including, inter alia: electricity cost cooling systems maintenance work hosting services This is the comment i recently got from @SIC in one of my threads: This makes a lot of sense so i decided to go and find out what the transaction fees are for the different mining companies out there. Perhaps, this information will be helpful in the future. Hashflare's Maintenace fees It goes like this... Maintenance and electricity fees (MEF) The mining process requires energy consumption and human resources for the maintenance. In order to cover these fees all users are issued with maintenance and electricity fees (MEF) accordingly to their contract type and hashrate. Ethereum contracts are not subject to any fees. Maintenance and electricity fees are not billed in an invoice. Instead the fees are deducted from the customer's balance at the moment of daily payouts. Despite the fact that balance is accounted for in BTC and the fees - in USD, the fees are deducted in BTC according to the current USD/BTC exchange rate which is beneficial for the customer in case the exchange rate trend is positive - more BTC remains in the customer's balance. source: Maintenance and electricity fees (MEF) How about that of other companies? Hashing24 I just queried their help center and this is what i got! $0.033 for every 100GH/s daily From this, you can see that it is not very different from that of Hashflare! While Hashflare will charge 0.0035, hashing24 charges 0.0033 I have no doubt that Genesis mining also shares same maintenace fees! check out: Genesis-mining Bitcoin Cloud Mining: How I Invested 500k|$1k To Earn 1.5k|$3 Daily 4 Life! from this, you can see that there is no much difference between the two of them @SIC so maintenace fee should not be the single factor that explains the higher profitability of hashing24 over hashflare!