The benefits of buying a new moped as opposed to a used one include getting a factory warranty with a new moped, not worrying about the history of the moped and availability of different models from the dealer. A new moped is likely to be more reliable.
With a new moped, buyers do not have to worry about cosmetic imperfections as the mopeds are sold as manufactured. Buying a new moped also assures the buyer of availability of parts and service from the dealer. A second-hand moped may have come from a line of discontinued mopeds making replacement parts hard to find.