CEX.IO and its partners have found an effective solution for people who want to join the Bitcoin mining community with their own mining - GHS, and be protected against those issues. We can guarantee a stable and profitable 24/7 uptime and output that you purchased on our exchange. But how do we do it? It’s easy - our partners authorized us to sell their facilities for their market price at our exchange.
You might ask why don’t we and our partners start mining bitcoins ourselves? The answer is simple and is partly explained in the definition of the Commodity Exchange term: “Commodity Exchange - permanent wholesale market of perfect competition, which according to certain rules, transactions of purchase and sale of a qualitatively homogeneous and easily interchangeable products” and hedge has been one of the most important functions of the exchange for the last 100 years.
CEX allows you to mine instantly when you purchase. You buy GH/s for Bitcoins. With the wild price drops in mining power, it's difficult to be profitable in the game. With CEX you can sell back your GH/s when you want.
Keep in mind price changes often around the time of a new difficulty, and this is an exchange, so you will need to stay on top of your account.