I've tried to make assumptions about this where I think the myth of early adopters being unfairly rewarded is something that is misunderstood. Not all early adopters will get a decent return on investment as it really depends on how they use bitcoin. Great profits would be made if they were willing to hold rather than spend it. They acept it a higher risk to invest in bitcoin early, so it is not true that bitcoin deserves to be called a ponzi scheme or pyramid investment scheme.