must avoid HYIP investments and go for earning bitcoins without taking high risk.One day you will know what actually means about success.
The current site that you call it HYIP is completely scam, the see the daily volume is high, then del the site, but if it honest HYIP then this will be too profitable, for all sides, but there is no.
HYIP At Now, can also be called gambling, with percentage of 50% lose, then you have 50% to win.
Just i think, they see who have referrals, then take ref's money, gives it to who prefer(main).