Off course everyone who has bitcoins can manipulate the bitcojn price but what you have to do is work together becuase you wnont change the price by your self you need
to sell all together and the price will rise for sure!
Ohhh. Sell altogether and it will rise? Is this some kind of reverse psychology?

I will give you an example. Iphone6 was created and they made 1 million of it. After a month 500,000 was sold but an event happened where people are selling it even for a half price without any reason. Will you still buy that Iphone6 after this news? Or some questions will come out of your mind? Why are they selling it? Right? Is there something bad about it?
So who will buy those if that event happen? No one and they have 500k left in stock.
So what will the company do? Sell it for a lower price. Hell they will even sell it Buy1 Take1 just to get ROI back.
That will be a lost for Apple.