Many players like to employ betting patterns that steadily increase the size of their bets until a winning spin comes along. The most well-known example is the 'Martingale System', in which you double your bet every time you don't win. Many players believe this to be a sure-fire winning system, but the risk of the Martingale System is that a player invariably starts to bet ever increasing amounts of money to do little more than break even. Even when starting with a stake of one unit of currency, a losing run of seven straight spins using the Martingale System will mean that the eighth bet needs to be 128 units to return a profit of just one unit.
To discourage this betting pattern most casinos set table limits – as does bet365. Long sequences of numbers and colours can and do occur at the Roulette wheel, and it is not extraordinary to see a sequence of, for example, many reds. You should enjoy sustained winning streaks when they happen, but be wary of wagering ever greater numbers of chips when the spins are going against you!