Ok, so according to your theory BTCe is a scam too. There are no details about individuals behind this exchange, yet millions use it. I have used it and I can bet you have as well.
BTCe has a clear and credible business model that allows them nice profits without scamming anyone. That doesnt prove they wont, and I do indeed consider BTC-e to be very high risk, but its entirely plausible they are legit. This ponzi of yours however, its utterly obvious if the operators really were able to extract the profits they claim from arbitrage, they wouldnt need to borrow your coins, pay outrageous interest rates and keep borrowing more to get filthy rich. Ergo, its a ponzi.
You do understand they also allow funding of your account via a bank wire. This makes it quite easy to find them in case something goes wrong. Actually, this happened a few weeks ago when another program went down, users managed to track the owner and now he is repaying everyone back.
Another point, take a look at
https://bitlendingclub.com/ and similar lending services. The average lending interest rate is 9.49% per month and people still lend there. Why? Isn't that an outrages interest rate? Why people dont go somewhere else and get it at much lower rate? Isn't this a quite clear business model? Are all these guys who lend there scam, HYIP or similar? Let me remind you they have funded 532 loans so far in the amount of 866 BTC and they are online only a couple of months. How is this possible? I could list a few more examples but there is no point, I understand you comment, I also have my fears but I have decided to continue using them and I am very close to my ROI.
Having said this, I still hope and believe they are legit, the risk is there as with anything else BTC related. Anyone who wants a risk free investment can put their money in the bank, that is fine by me. There s no point arguing about this again, a few posts up, I have clearly stated my position about this.