Terrible rip off site. They send you messages supposedly from other subscribers, but the profiles for those subscribers have already been deleted when you do respond. They just make $#*! up out of thin air.
They should definitely be investigated by the FBI, since they are using the Internet to commit fraud they are guilty of Wire Fraud.
Title 18 of the US Code ยง 1343 says:
Whoever, having devised or intending to devise any scheme or artifice to defraud, or for obtaining money or property by means of false or fraudulent pretenses, representations, or promises, transmits or causes to be transmitted by means of wire, radio, or television communication in interstate or foreign commerce, any writings, signs, signals, pictures, or sounds for the purpose of executing such scheme or artifice, shall be fined under this title or imprisoned not more than 20 years, or both.