Betting systems are popular because they offer structure. The Martingale is the most familiar: double your stake after every loss, and a single win returns everything plus one unit. On paper it looks tidy. In practice it meets two hard limits.
The arithmetic of doubling
Start with NZ$5 on an even-money bet. After a loss, bet NZ$10, then NZ$20, NZ$40, NZ$80, NZ$160. Six losses in a row means you have put in NZ$315 and need NZ$320 on the next bet just to finish one unit ahead. A streak of six losses on a fair coin has a chance of about 1 in 64, which is not unusual over an evening of play.
On a roulette table with a zero, the chance of losing an even-money bet is slightly above one half, so streaks come a little more often than on a coin.
Limit one: your bankroll
Doubling grows fast. Ten losses in a row would call for a bet of NZ$2,560 from a NZ$5 start. Most players do not hold that sort of balance for a single bet, and the ones who do are risking a large sum to win NZ$5.
Limit two: the table maximum
Casinos set a maximum stake per bet, partly for this very reason. If the cap is NZ$500, your progression stops at a fixed point, and a long losing run leaves you unable to place the next doubled bet.
Other systems, same problem
- Paroli, or reverse Martingale, raises stakes after wins. It limits loss but cannot change the odds. - D'Alembert shifts the bet by one unit up or down. It is gentler, but the edge still applies to every bet. - Fibonacci follows a number sequence. It grows slower yet reaches the same conclusion.
Each system rearranges when you win and lose, not how often. The expected loss per bet stays at the house edge multiplied by the stake, so more bets means more expected loss.
A sensible takeaway
If a staking plan helps you pace your session, fine, as long as you set a fixed budget and treat it as entertainment. Platforms like Casiny publish their table limits in the rules, which is a good place to see where a progression would break. Adults only, please, and never chase losses.