What u r saying is about Ponzi Games based on classical Ponzi Schemes like we saw in WeeklyPonzi.com or NextPonzi.com. In a classical Ponzi Scheme based game, old users are paid with new user's fund and operator always has an incentive to run away with the fund and that is what has happened most of the times. But, lately a new concept has emerged in Investment Based Games. You can experience it at CrazyPonzi.com.

In www.CrazyPonzi.com new investors may win old investor's deposits well, because every deposit will expire after 120 hour. U can call it a game of greed where everyone is playing against the other. The design makes sure that stealing the bankroll wont be economical for the operator as he makes more out of commission by running the game honestly. Something absolutely NEW to the bitcoin world. Worth a try...