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.
Scrypt.cc is more ponzi then all of them together. 60 days ROI and you sell this to outsiders, yeah right.
Do you have any proof that Scrypt.cc is giving ROI in 60 days ? Then I must try them...
There is a calculator on their home page which gives you 60+ days result. Recently they had some drop in payouts but ROI s still unbelievable. No proof they mine at all though.