Here’s why those 2 things matter:
Eventually, you’ll need to place a bet so large that you either won’t have enough money to cover it, or it will be higher than the betting limits at the table.
Doubling your bet over and over again adds up far faster than you think.
Let’s assume you start with $1000. This seems like plenty of money to play with if you’re making $10 bets at the roulette table, right? It’s 100 units, so it covers 100 bets if you’re flat betting.
Here’s how fast the progression eats away at your bankroll, though:
You lose your first bet of $10, so you now have $990.
You lose your 2nd bet of $20, so you now have $970.
You lose your 3rd bet of $40, so you now have $930.
You lose your 4th bet of $80, so you now have $850.
You lose your 5th bet of $160, so you now have $690.
You lose your 6th bet of $320, so you now have $370.
Your 7th bet is supposed to be $640, but you don’t have enough money to cover the bet. This ends your attempt to use the Martingale System.
Yes, it’s unlikely to lose an even-money bet 6 times in a row. But most people underestimate how unlikely it is. It’s going to happen occasionally, and if you’ve spent any time in a casino watching the game, you’ll realize it happens more often than you think.
Here’s the other problem with this system. Even when it works, your net winnings are small. Your eventual big loss is going to eat up all those small wins and then some.
The Martingale can be fun in the short term, but over the long run, it has no effect on the casino’s edge. They’re still going to win all your money if you play long enough.