i can explain in details but its boring in short it goes like this
you me and others are small fish in a large pond, bigger fishes are deep in, every once in a while they come up and eat all other small fishes and then they go back in hibernation 
they are market movers and before you know it, you would lost all the capital as your holding power is no where near them, they can hold billions where we can barely hold millions.
and there is a good amount of inside trading and profit selling which leave small investor very very vulnerable