Unlike traditional, often failed investment-based cloud mining services, NiceHash provides purely technological advanced cloud mining experience. As a buyer you can put quick orders and rent massive amount of hashing power, point it to a pool of your choice and mine Bitcoins or any other altcoins such as Litecoin, Dash and other emerging digital currencies. By taking advantage of variable coins mining difficulty and smart trading you can make great profits with hashing power, rented through NiceHash service.
Also, in this FAQ you'll find some hints for maximizing the profits: https://www.nicehash.com/index.jsp?p=faq#faqb15
Best regards,
NiceHash team.