since he does not know the definition of a [Charles] Ponzi scheme and bitcoin is clearly not one who the hell knows

each and every bitcoin is worth the same at any given time and has no set value, by any definition it is not a [Charles] Ponzi scheme

prices go up as people join and down as people leave this is simple market supply and demand nothing more

third  result when i googled "what is a ponzi scheme"
http://www.sec.gov/answers/ponzi.htm