Warning sign #2 was insane interest rate
Obvious scam. If you want to profit from these shady HYIP schemes, then go on over to talkgold forums and "invest" in brand new HYIPs that start advertising. The first one in on the Ponzi scheme is a winner. Double your money, leave a positive review then move on to the next brand new HYIP ponzi. Look at all the threads with the same people in each one, somebody is making money, hordes are losing it (like you).
To add on..
Warning sign #3 was a .tk domain. Never trust a .tk domain. Not all is bad but most of them are scamming sites.
warning sign 4 : Russian mod..
Must be caerefuly
it has very high risk