But no one here is saying that Bitcoin is going to steal our wealth - they are saying that esoteric investments is (if we are silly enough to give it to them).

Every one of these schemes gets defended by people saying "There's no evidence it's a scam." Of course there isn't, until they run off with the money.
If you get lucky you can make a bit of money, if you get in and out quick. New scams like this appear every day - this one just got our attention because they take Bitcoin. Most of them disappear after a few days or a few weeks. Bitcoin-trader lasted an exceptionally long time, due to the confidence they built up in the Bitcoin community with their marketing activities. Esoteric is clearly hoping enough of that confidence is left (there still seems to be some, amazingly, judging by the talk in the bitcoin-trader thread). The thing to remember is there is nothing to suggest esoteric will last anything like as long as bitcoin-trader did though, because most of that "confidence" has clearly evaporated.