Lets look at some examples from your site.
127 kahnur 0.005 0.007 Expired 00:00:00
126 Shikaku 0.0078876 0.01104264 Paid 00:00:00
125 haha 0.0141876 0.01986264 Expired 00:00:00
124 Schemer 0.1 0.14 Expired 00:00:00
123 FIALKA 0.01 0.014 Expired 00:00:00
122 yazx 0.0026 0.00364 Expired 00:00:00
121 mrfizzy 0.00126 0.001764 Paid 00:00:00
Why was #125 not paid from the bankroll provided by the expired "investments" from #122 #124. If the only indicator to pay out is another "investment" after me, the bankroll can certainly increase to any amount and your statement from above is wrong.
I wondered that as well at first. It looks like #124's 0.1 would have meant the bankroll would be big enough to pay #125.
That logic is incorrect. #124's 0.1 was used to pay an earlier investor, #116 maybe. In other words #125 hadn't even joined the line of people waiting to be paid when #124 made his bet, but there was already a line. A guy near the front of the line got it.
I personally don't consider any kind of Ponzi to be scammy unless they are selling it as guaranteed profit. Most of them promise to return X% profit within Y time because the are great at trading / mining / whatever. If they make it clear that you only get paid if enough people join after you, then that turns it into a game where everyone knows the risks, and I don't see anything wrong with that. This game has a FAQ:
3. So, what is the catch ?
A: Every single investment will expire after 120 hour. Hence every player needs to have more players investing after him before the investment expire. The best way to do this is to spread the word about
www.CrazyPonzi.com to as many bitcoiners as possible using your referral link shown in the dashboard.
I think that's good enough. The English could be improved, and I'd like to see it explicitly state that you either get paid out in full or not at all. At first I was thinking I'd get whatever was in the bankroll when my bet expired, up to the full 140% but apparently that isn't the case. But that's a nit pick.
[ Edit: it seems to me that making bets all-or-nothing just encourages people to place a long series of minimum bets instead of a single large bet, because then they can get paid out partially. You should pay out whatever is in the bankroll when a bet expires to simplify things. ]
I'd prefer a little more transparency in this game. Maybe show the bankroll after each "paid" status as well as the number of the bet which enabled that older bet to be paid out. Players have to decide whether they trust the operator not to run with their coins, just as they do with any other gambling game (provably fair or not). Probably fairness makes cheating detectable, but can't prevent it happening.
tldr: IMHO this isn't a scam (it's just a gambling game with a whopping 10% house edge and in which the operator can potentially cheat by betting against himself).