Whales has been manipulate the price since many years ago, on stock exchange, forex, etc. and now bitcoin, but the bitcoin price still run and go high. Even though they sell their bitcoin there is so many people out there wants to buy, so why we scared of this whales?
The one thing that make me scare is: they (whales) buy bitcoin in big amount and never sell them
Not precisely a Whale, but coming close to the described effects:
Trendon Shavers (Pirateat40) basically did the same approach, at some late point in time he had to buy back 500.000 BTC from market after prolonged price suppression by dumping customer's deposits.
Timepoint has been close to his arrest. Later convicted for running a ponzi scheme.
Nobody on our modern times can reach any compareable impact on these markets. Individuals became to small in comparion to daily cashflows.