Best Line vs Worst Line: What's the Real Cost?

Line shopping always sounds abstract until you put dollar signs on it. This article puts dollar signs on it. The numbers are real, the math is simple, and the conclusion is the same one every sharp bettor has already reached: taking the worst available price is the most expensive habit in sports betting that almost no recreational bettor accounts for.

The base case: -110 vs -105

Take a standard NBA spread. Book A is offering -110, Book B is offering -105 on the same side, same number. You bet $100.

At -110, you risk $110 to win $100. At -105, you risk $100 to win $95.24. (We standardize on $100 stake to compare, so at -105 you're winning $95.24 per $100 stake.)

Wait, that looks like Book A is paying more. It's not. The actual comparison is risk-adjusted.

Let's flip it: how much do you have to risk at each price to win the same $100?

• At -110: risk $110 to win $100. Cost-per-win: $110.
• At -105: risk $105 to win $100. Cost-per-win: $105.

You save $5 per $100 won by betting at -105 instead of -110. That's a 4.5% savings on every winning bet.

Across 200 bets per year (5 per week, 40 weeks), at $100 stake, with a 50% win rate, you'd win 100 bets. The cumulative savings: 100 wins × $5 = $500 per year, recurring, just from a 5-cent improvement on the price.

The real-world case: the gap is bigger than 5 cents

5 cents (-110 vs -105) is the smallest meaningful gap and represents the floor of price variance across U.S. books. Real-world gaps are often larger:

• Spreads: 10 cents (-110 vs -100) is common across books on midweek NBA games.
• Totals: 20 cents (-115 vs +105) on the same total is common, especially on smaller markets.
• Player props: 30 cents (-125 vs +105) on the same point line is normal across major books.
• Heavy favorites: a -300 vs -260 difference on the same NBA moneyline is real and routine.

The floor for line shopping value is 5 cents per bet. The ceiling is much higher. The actual gap depends on which markets you bet and how spread the book pricing is at the moment.

Bet-size scaling

The math scales linearly with bet size. Same example, different stakes, same 200 bets per year, same 50% win rate, same 5-cent improvement:

• $25/bet: $125/year saved
• $100/bet: $500/year saved
• $500/bet: $2,500/year saved
• $1,000/bet: $5,000/year saved

Most recreational bettors are in the $25 to $200 per-bet range. Even at the low end, a few hundred dollars of recurring annual EV is meaningful. At higher stakes, line shopping becomes the single largest EV decision a bettor can make.

Player props: the highest-EV market to line shop

Props compound the variance because both the number and the price differ across books. Take a Stephen Curry points prop:

• Book A: Over 27.5 (-115)
• Book B: Over 27.5 (-105)
• Book C: Over 28.5 (-110)

If you want the over at 27.5, Book B is best (-105 saves you 10 cents per bet vs Book A). If you'd happily take the over at 28.5, Book C's number is half a point better. Which is preferable? It depends on Curry's expected scoring distribution. If you think he goes over 28 about 53% of the time, Book C's higher line is better. If you think he goes over 28 about 50%, Book B's number-and-price combination wins.

Across a season of, say, 150 prop bets, getting 5 to 8% better EV on each one is roughly $150 to $240 per year saved at $25 per bet, $600 to $960 at $100 per bet. Props alone often justify the entire line shopping habit.

Compounding across markets

If you bet a mix of spreads, totals, and props across an NFL season:

• 40 NFL spreads × 2-cent average improvement = $80 saved (at $100/bet)
• 30 NFL totals × 3-cent average improvement = $90 saved (at $100/bet)
• 50 NFL props × 5-cent average improvement = $250 saved (at $100/bet)

That's roughly $420 in NFL alone for a casual bettor at $100 per wager. Add NBA, MLB, and NHL through the year and you're easily north of $1,200 in recurring annual value. None of this requires being smart about which side to bet. It requires only that, given a bet you'd already place, you place it at the best available price.

Why this is the easy edge

Most edges in sports betting require either superior modeling or superior information. Line shopping requires neither. It's a price-comparison habit. It's the same thing as buying a flight on Google Flights instead of paying full retail at the airline. The information is public, the comparison is fast, and the savings are real.

If you're betting at all, you should be line shopping. Use MatchupOdds to compare every major U.S. book on every game. Browse today's biggest line differences to see where the largest gaps are right now. Read more in our main line shopping guide.

Frequently Asked Questions

How much does taking the worst line cost?

On main markets, taking the worst line typically costs 1 to 4% of EV per bet vs the best available. On player props, the gap is often 4 to 8%. Across hundreds of bets per year, the cumulative cost is in the hundreds to low thousands of dollars at standard bet sizes.

Is the difference really that big?

On any individual bet, the gap can look small (e.g., -110 vs -105). Compound across enough bets and the cumulative gap dwarfs anything most bettors gain from "picking the right side."

Why don't more bettors line shop?

Inertia, mostly. Comparing prices takes 30 seconds, but it requires having multiple accounts and a habit. The bettors who do it know it works.

Does the gap shrink as games approach kickoff?

Yes. Lines converge as more information arrives and more action settles. The biggest gaps are usually 24+ hours before kickoff, when models still differ. Closing lines are tighter but still vary.