you know what is the problem with ponzi? people. Yes, because we all know they will turn into a scam, but can you get a profit with it? yes, if you start right from the beginning, but that's not the entire history, because if the first investors are too greedy and put a lot of money at the very first, it will turn into a scam right away. if they just put the minimum, they will left some room for other people, and everybody wins (not everybody, just the first ones, but if they put just the minimum there will be a lot more "first ones" than if for example the first one puts 100 BTC, of course that will be the only investor that will ever be, because the owner will run with the money right away ,you get it? So please! please just put the minimum, let other jump in too, imagine that the minimum is 0.002 and you put 0.02, yeah ,is not too much, not at all, but you are taking the room of 10 people, because the owner will be 10 times more close of his goal, i mean not 10 times of the goal, but you understand what i mean, for these 0.02 he didn't have to wait for ten people, he just waited for one, get it? so yeah if you put just the minimum it is slow, i know, but you have A LOT of ponzi sites to jump in.
You are 100% correct, ponzi are not bad, they are even worth to play and earn some profit on it, the only problem are investors, greedy investors. If everyone play fairly then smart investors can make good profit for long term.