How a sportsbook makes its money
Take a game that is a genuine coin flip. A fair price on either side pays 2.00x. A sportsbook prices both sides at −110, which pays 1.91x — and because it does that to both sides, it takes in more than it pays out no matter who wins. That gap is the house edge: about 4.5% of every single bet.
On one bet, 4.5% sounds like nothing. The catch is what happens when you stack legs into a parlay. The margin is charged on every leg, and it multiplies.
| Legs on the slip | House keeps | You get back, on average |
|---|---|---|
| 1 | 4.5% | 95.5% |
| 2 | 8.9% | 91.1% |
| 3 | 13% | 87% |
| 4 | 17% | 83% |
| 5 | 20.8% | 79.2% |
| 6 | 24.4% | 75.6% |
| 7 | 27.8% | 72.2% |
| 8 | 31.1% | 68.9% |
| 9 | 34.2% | 65.8% |
| 10 | 37.2% | 62.8% |
Every leg priced at a standard −110 line, an overround of 4.76% (each leg multiplies the edge by 1.0476). Real books vary by market and often charge more on same-game parlays, so this is the generous version.
Ten coin flips
A ten-leg parlay of coin-flip games has a fair price of 1,024x. A book at −110 pays about 643x. That parlay loses about 37% of everything ever staked on it — and it is the kind of slip the ads show somebody hitting.
What 1v1 does instead
Fair prices
Every multiplier is exactly the probability flipped over. No overround, no hold. Your slip shows what a book would have paid next to what it is really worth.
Stakes that cost effort
Push-ups, dishes, rides, a karaoke song. There is nothing to deposit, nothing to withdraw, and no amount you could lose that would hurt next month.
Proof, not trust
The loser films the forfeit. Late on a debt and your account drops into bad form, where everybody can see it — and you cannot post new bets until you pay up.
Limits that bite
Every stake has a ceiling applied after the multiplier. A four-leg parlay can't turn forty push-ups into four hundred. A sportsbook keeps about 17% of four-leg slips; this one caps the forfeit instead.
Why bother, then?
Because the good part of a bet was never the money. It is caring who wins. It is your partner on the couch suddenly invested in the fourth quarter because the loser does the dishes. It is the group chat when somebody posts forty push-ups with the scoreline burned into the video. None of that needs a card on file.
If betting has stopped being fun
If you are betting money somewhere else and it is costing more than you meant — in money, time or sleep — you are far from the only one, and it is worth talking to somebody.
- The Responsible Gambling Council, a Canadian non-profit, has free information and support at responsiblegambling.org.
- In most provinces, calling 811 reaches free, confidential health advice any time.
- Tell someone you trust. It is a lot lighter said out loud.