The Cashout Trap
The cashout button looks like a profit-locking feature and it actually is a structured product the book has priced to extract twenty to thirty percent of the ticket's fair value at the moment of your choosing. On a $100 bet at plus two hundred that has appreciated to a seventy five percent win probability, the fair value of the ticket is two hundred twenty five dollars and the book typically offers one sixty five, booking sixty dollars of guaranteed margin while the bettor congratulates themselves on locking in sixty five dollars of profit. Hold the position to settlement; variance is the price of edge, not something you pay the book to skip.
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What Is Cashout
Cashout is a structured product the book offers to terminate a live bet early for a fixed amount. The fair value of any live ticket at any instant is the ticket's total payout multiplied by the current win probability. The book's offered cashout price is typically 70-85% of that fair value. The gap is the book's guaranteed margin on the cashout itself, on top of any remaining exposure to the underlying market.
The Worked Example
A $100 bet at +200 American odds (decimal 3.00). Total payout if it hits: $300. Implied probability at placement: 33.3%. Mid-game: the bettor's side is winning. Current win probability has risen to 75%. Fair value of the ticket at this instant: $300 x 0.75 = $225. Book's offered cashout: $165. Bettor's perceived profit: $65 locked in. Book's expected margin on the cashout: $60 = 26.7% of fair value. This is roughly 5.7x the pregame standard hold of 4.7%, extracted on a trade the bettor initiated.
The Behavioral Layer
Kahneman and Tversky 1979 prospect theory: humans weight losses about 2-2.5x more than equivalent gains. The certain-gain effect: subjects prefer a smaller certain gain over a larger expected gain at probabilities above ~30%. The cashout button is the perfect interface between this behavioral asymmetry and a structured margin product. The bettor calls cashing out 'discipline.' The book calls it 'margin.' Both are right.
The WagerBird Answer
WagerBird position sizing assumes every position runs to settlement. The cashout button is not a parameter in the model. Variance is the price of edge. Rare scratches are triggered by model signal, not by emotional response to a green number on the screen.
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