Winning at Roulette at the casino
None. No amount of varying the size or sequence of bets changes your probability of winning. Probability of winning depends on the rules of the game and the equipment used, not when and how much you bet.
Blackjack systems work because some times the equipment-the undealt cards in the deck(s)-provide the player a greater than 50% chance of winning. The system identifies those deals and asks the player to increase his bet when it occurs. If those deals did not occur or could not be detected, there would be no point in varying your Blackjack bets. And that is exactly the scenario in Roulette. Since you can not identify in advance rolls when your chances of winning are elevated, varying your bets has no effect on the amount you can expect to lose. E.g., if you bet $10, 000 $5 at a time, or sometimes, $5, $50 or $500, it makes no difference to the amount of money you expect to lose by playing, and it certainly won't make you a winner at Roulette.
Re: Mike Caro's System
Mike Caro's roulette "system" is a complicated in-joke. Read his rules carefully while looking at a roulette wheel. His rules exclude all roulette bets! That is why he can say so confidently that, "My system reduces the house advantage to literally zero."
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Why are you asking this question if you're a roulette pro?