Bankroll and Risk

Even a profitable approach has long losing runs. That is variance, not failure, and the arithmetic is unforgiving: risking a quarter of a bankroll per bet makes ruin likely within a handful of losses regardless of how good the selections are.

A defined bankroll and a small unit size turn each bet into a fixed fraction of a known total. This is what makes a bad month uncomfortable rather than terminal, and it is a separate skill from choosing bets well.

Drawdown is the number that matters here, not average return. The average is what you get if you are still betting at the end, and the drawdown determines whether you are.

V8 publishes performance in units and does not tell you what to stake. That is a deliberate boundary, not an omission.

Terms used: Bankroll, Unit size, Drawdown, Risk of ruin

Bets that look independent often resolve on the same underlying result. Backing a team on the moneyline, on the spread, and on a player total from that team is largely one bet on that team playing well, staked three times.

That matters because a staking plan assumes independence it does not have. Three one-unit bets that all depend on the same outcome are a three-unit position, and a bankroll can take a much larger hit than the plan intended.

The habit worth building is to ask what single result would make every open position lose at once. If the answer covers most of your exposure, you are less diversified than the number of bets suggests.

Terms used: Correlation, Concentration, Bankroll, Unit size