Ponzi/Pyramid schemes often are honest about this. What they are usually not honest about is the mathematical impossibility of it being possible for it to keep going very long. But some simply bet on people being greedy enough to take the chance that they are getting in early enough...
As such I think it is good commentary on Bitcoin and cryptocoins in general - a lot of people do appear to enter expecting a pyramid, and just hoping to get theirs before it collapses.. The question is what proportion they make up.
