Any coin that promises a 1000% ROI on an expensive masternode is a red flag for me. You have no idea what the Roi will be as it depends on the market price of Scriv.
ROI is the % of the MN required coins so you can calculate exactly what ROI will be, it doesn't have to do anything with the market price.
No, real ROI will depends on total number of masternode in the network at specific point of time; and price of Bitcoin.