I agree with you that bitcoin is not a pyramid by pedantic economical definition. I even trust in honestness of bitcoin software developers and earlier adopters.
I disappoint you by two things:
1. I've detected that current adopters - 'premium' members - are NOT sincere persons.
2. bitcoin society is prooven to crash independently on WHETHER current adopters ARE sincere or NOT.
Ok, I don't know if bitcoin will crash or not. Maybe you are right. I know too little about it at the moment (I became aware of bitcoin today!
).It will be a real test for the bitcoin system the coming months. For the system to survive and become strong it must be able to handle all kinds of dishonest persons and mischief.