Each Extra Parlay Leg Makes Bettors More Confident And Less Likely To Win, Data Shows
Across 2.4 million slips, confidence rose with every leg added. So did the number of slips lost by a single leg, which bettors filed under nearly winning.
Bettors grow more certain with every leg they add to a parlay while their chance of winning roughly halves each time, according to an analysis of 2.4 million slips shared with Gambling Paper by a sportsbook that asked not to be named because it would like to keep selling parlays.
The finding fits on one chart. A line labelled Confidence rises from bottom left to top right. A line labelled Probability falls from top left to bottom right. They cross at three legs, a point the sportsbook’s analysts call “the sweet spot” and ours call “where it stops being a bet and becomes a hobby.”
Confidence by number of legs
- Two legs: “Should be fine”
- Four legs: “Basically free money”
- Seven legs: “Screenshotting this now”
- Twelve legs: a group chat renamed after the slip
Customers on a twelve-leg slip report the highest satisfaction of anything we sell. They report it on Saturday morning. We stop surveying them at about four in the afternoon.
The one-leg problem
Of the slips that lost, 38 percent lost by a single leg, and every bettor surveyed in that group described the result as nearly winning. Most placed another slip within the hour, usually with one more leg, to make up for the one that had let them down. Readers of our sportsbook coverage will recognise the pattern, as will anyone with a phone.
Methodology: Slips were drawn from a twelve-month window and grouped by leg count. Confidence was measured by survey on a scale from one to “lock”. Slips with more than twenty legs were excluded and referred to a specialist.
