ive actually tried out that system myself and true,it has made me some profits. One thing you forgot to note is that with these bets you usually gotta cover the 0 and 00. The thing with roulette is its a fast paced game and it never stops. Your sitting there waiting for the right moment and maybe within that hour your likly to take risks because of boredom,and start making stupid bets and trying to recoup your lossess.

In gambling set a target and stick to it. In many peoples eyes when their on a winning streak then tend to play on because they think luck is in their favour.