I would point out that the disadvantage I feel is people jumping in at the wrong time.
Always like that - be it stocks, speculation, pyramid schemes: the masses of small fishes give their money to the early players... It's psychology of crowds.
this is not a psychology issue, but a theories of capitalism which deals the free market. the large capital can play price and take benefit from small capital . therefore, creation crowdfund token, or bots trading can minimalizir whales playing dumb and pump .
For me the advantages in investing bitcoin is that it is free from bank charges and btc offers less risk from merchants while the payments cannot be reversed in comparison to the present traditional banking. Disadvantages of bitcoin, it is still only accepted by a very small group of online merchants.