If CEX initially sells the mining power for say 0.01 BTC / GH, it presumably receives the 0.01 BTC which it uses to pay for electricity and the miners that are used.
Surely, that 0.01 BTC will soon run out with electricity and maintenance costs, so, where does the other income come from to pay for that, since the mining power GH is then traded between users, not bought directly from CEX.
So then, what about people that have put their BTC into this service and purchased mining power. I presume that currently they're getting 0 returns since the cloud mining service is turned off?
Yes, what did happen with their mining pool? Last year it (ghash.io) was #1, and so big that people were really concerned about them having over 50% of the network power.
Edit: 'Madness' posted while I was typing. If the #1 pool cannot make money, hopefully prices will rise soon and they can get back in business.