I do sometime like these Ponzis.
If you are able to manipulate them like me, in order for maximum profits, you will definitely lose less.
It is not recommended for unexperienced members but I see it as gambling so it is not as bad, obviously it is better with the more honest sites tat state they are a ponsi (either directly or indirectly).
What yoiu are saying is like a dice game EV+ for the gamblers and people get fucked even after knowing its a scam just by reading comments like yours,"oh we can profit if we withdraw soon" but in reality they never offer a chance to ROI no matter how honest ponzi it is.