This is called Martingale System you'll always win untill you get ninjed.
Dont bother Trying this at Red/Black Online Casino's Roulette.
You might would do that thinking "its theoreticly impossible to get the same out of 2 outcomes more than six times in a row" which is correct (in real life)
Cuz this and some other technics are used at real life casinos roulette, they'r not illigal but since casinos have admission rights Pitbosses kick you out of the casino as soon as they see you using mathematical systems to beat any of the games, and believe it is damn possible to beat almost them all, but pitbosses wont let you. Believe me i've tryed
So then i had this idea of going to online casinos where there are no pitbosses and you can system up like you want, and guess what, they'r all scripted to screw up the irl theory "it's impossible for you get the same out of 2 outcomes more than six times in a row" i went up to 12 times hitting the same color. Glad i was using Bonus.
So this is a real good system since you'll always win if you have the gold to bet over, but you'll probably get ninjed if the guy sees too much gold in his bags....