that markets are efficient and any prediction of it's movement is fruitless. Isn't the Bitcoin price random too?
not being able to predict the market is not equal to the price being random. it is just that you can't predict it, nothing more.
besides you are missing the main reason for bitcoin which is not its price or for people to predict it. the main reason is for bitcoin be a currency that nobody can prevent you from using it. the rest is unimportant.