Yess we can now see the difference with other classical ponzi:
With classical ponzi the "last investor" takes more risk than the previous one...
With this ponzi it is not so,the "last investor" can be more lucky as the previous one.
Thanks for reviewing open-ponzi.com game

You are right and now the game is in process of some kind "stabilization".
Even if no one will invest (but already we see new investment of 0.15 btc) game will return to its initial "brand new" state.