In my opinion this is one of the main problems here, that you, if you are a little fish can not affect market, but manipulated market can affect your earnings, decreasing them to zero.
I guess that is not the problem here, disregard how much you invested or how much you have if many bitcoin holder pulls off the price will drastically go down. We can be Whales, group of person can be whales too, i mean we are the reason why bitcoin fluctuates, but because of our greed bitcoin will be just a means of speculation of us.
that is true about half the market. what you are talking about is the overall market movement that is the result of all the traders that are in that market. manipulation won't work when it is going against that market movement. for example last year I believe it was around $2000 that we saw a bunch of bear whales started dumping to push the price down, they obviously were going against the market and they were crushed and lost a lot of money because the market moved up and killed them like bugs.
but when a whale goes with the market movement like pushing the price lower when it is already a bear market then they can manipulate it harder.