Why we invent stuff: Either to make big bucks, or to make life easier for ourself. Creating algorythms and automated programs that does the buying/selling stuff for you makes perfect sence. Does this mean quote on quote robots will rule the stock market? In my oppinion no. They are not sentient, they are only behaving as they are told to behave. When we get AI or VI whatever you might call it that can change their behaviour at free will to increase effiency etc, then yes humans will have lost the control over the stock market.