yes, this was thought of a long time ago, called nightingale theory i believe, only prob is one time out of say 1000 you will lose 10 coinflips in a row and lose your entire bankroll. Also most casinos have a stop to this system by enforcing a max bet. Say min bet is 5 max bet is 100 5,10,20,40,80- merely have to lose 5 coinflips in a row and your broke, while each time you only gain 5-basically if you do the math the odds of losing your whole bankroll are greater than that of the amount of money you gain winning over and over with the occasional loss. im sure someone could do the math for you with actual AC/vegas casino bet limts/max