If this is not an April Fools' joke, it would be interesting to know what miners are they using to achieve such incredible roi. Well, scrypt.cc would defend that they are trading altcoins, but what about the others 
I think they are ponzi.
I think they are ponzi.
Not a joke, some of these might not actually be mining bitcoin, I'll leave the speculation to the viewers, but if you want to compare current daily payouts - this list might come in handy...
And of-course - "caveat emptor"
Cloud Mining Risk Assessment:
https://bitcointalk.org/index.php?topic=878387.0
Cloud Mining Risk Assessment:
https://bitcointalk.org/index.php?topic=878387.0