Firstly no money management system can get you an edge in roulette……or can it? I think what you have to remember is that we are talking about live roulette here and not online roulette with random number generators being used to create the results. For a money management system or betting system not to be profitable on roulette then we need one criterion to be present and this is that the results are totally random.
The next question is……..can we always assume that the results on a standard roulette wheel are always random? In my experience of nearly ten years inside the gaming industry then I do not believe that they are. Or at the very least that they are not random all the time. If you back even chances on roulette then you are only at a disadvantage of around 1.35% to the house. The house edge is 2.70% but this falls to 1.35% on even chances because if zero arrives (assuming a single zero wheel) then you get half of your bet back.
The pay offs are 35-1 but there are 37 numbers in the wheel and dividing 100% by 37 gives us 2.70. So if you can identify a bias that is being caused by either natural forces or by inadvertent actions from the dealer then you may just be able to gain an edge. As an ex-croupier then I know that part of the dealers job is to make the result of the spin as random as possible……I also know that this isn’t always achieved even by skilled croupiers.