There are no maintenance fees for Ethereum (ETH) Contracts.
To calculate Mining profitability, we recommend you use a tool such as the CryptoCompare Mining Calculators to determine daily, weekly, monthly, and annual payouts. With Cloud Mining, we do not charge for electricity; so please insert no costs for this when calculating payouts.
Cost and benefits comparison chart
A chart to compare the costs and benefits of having your own hardware to having a contract with Coinmint
Why is it more profitable to mine with Coinmint?
Thanks to some great partnerships we have established with energy providers, as well as to our large scale purchases, we get a better price on our power and employed technology. This means we buy the cheaper than the market price. What also bears great importance, considering the maintenance costs, is the storage of the miners: we have several farms around the globe, and each location was chosen to fulfill two important criteria: cheap electricity supply and little or no need for cooling.
There is much beauty in purchasing and setting up your own hardware, we know that. But it's for those who are technically very skilled, can solve tricky complications, and generally see the fun in maintaining a complex construction rather than in earning profit with it. For most people these are annoying, unnecessary difficulties, and our solution is targeted exactly at them. To put it simple, our service is providing a better mining experience at a lower cost.
There are many who tell us that they can mine cheaper by themselves according to their calculations. However, it always turned out that they forgot about one or more of the above listed costs. We did our calculations, and we think it's impossible to mine more profitably on a smaller scale, at home and by yourself.
Lastly, we recommend you use an independent tool to calculate your earnings, such as Coinwarz. Tools such as this will give you a good idea as to what your daily payouts will be.