Added scrypt.cc. Please note that it is quite different from anything else on these charts, so proceed with caution. High yield comes with an initial investment cost roughly twice the cost of buying mining hardware as of today (e.g. Gridseed Blade). That is counterbalanced by the ability to trade hashpower in a fairly liquid market. Weigh carefully whether or not that is an acceptable risk for you.
Honestly Scrypt.cc sounds like a ponzi scheme. High initial investment? check... Unrealistic rate of return? check... at some point they'll disappear with your money, it almost seems guaranteed.
Well, I dont defend Scrypt.cc (as I dont use them), but approx the same was said previously about Cex.io...
Cex.io grow big, Scrypt.cc is (is it?) the 1st scrypt cloud mining service, time will tell, there is always risk when trusting your funds to some online service (just remember inputs.io, 50btc, gox, coinex etc)