An odds boost is a promotion where a price is increased above its normal level. For example, a team's moneyline might be boosted from +150 to +200. Boosts are common marketing tools in real-money betting, so it helps to understand them, mainly so you can see through the marketing.
MockSport does not offer real-money promotions. This guide is for understanding how boosts work.
How a boost works
A boost takes a market and offers a better price than normal, often for one selection, sometimes with a lower maximum stake.
Example:
- Normal price: +150 (decimal 2.50)
- Boosted price: +200 (decimal 3.00)
On a 100 stake:
- Normal profit if it wins: 150
- Boosted profit if it wins: 200
Calculating the real value of a boost
To judge a boost, compare the boosted price with a fair estimate of the true probability.
Step 1: estimate the fair probability. Start with the normal market and remove the margin. Suppose the normal market implies 40%, and after removing the margin the fair probability is about 38.5%.
Step 2: calculate expected value at the boosted price.
- Win: 0.385 × 200 = 77
- Lose: 0.615 × 100 = 61.5
- EV = +15.5 per 100 staked
In this example, the boost creates positive expected value. That means the promotion is genuinely generous on this one selection.
Boosts that are less generous than they look
Many boosts look impressive but aren't. Common examples:
Boosted parlays
A three-leg parlay boosted from +600 to +700 sounds great. But if each leg carries a margin, the unboosted parlay's edge against you might be around 13% or more. The boost may only reduce that edge, not eliminate it. See parlays explained.
Long-shot boosts
A boost from +2000 to +2500 sounds big. But if the true chance is only 3%, then:
- EV at +2500 = 0.03 × 2500 − 0.97 × 100 = 75 − 97 = -22 per 100
Still negative.
Low maximum stakes
Many boosts cap the stake at a small amount, limiting how much the promotion can cost the house.
Why boosts exist
Boosts are marketing. They:
- Attract new customers.
- Encourage people to try certain markets, especially parlays.
- Create excitement around big games.
- Keep existing customers engaged.
Even generous boosts are calculated costs. The house expects to make it back through regular activity. See why sportsbooks win in the long run.
How to evaluate any boost
- Find the normal price. What would this pay without the boost?
- Estimate the fair probability. Use the normal market, removing the margin.
- Calculate EV at the boosted price.
- Check the conditions. Maximum stake, eligible markets, any restrictions.
If the EV is positive, the boost is generous. If it's negative, it's marketing dressed up as value.
Boosts and psychology
Boosts create urgency: "only today," "limited time." They also encourage picks you wouldn't normally make. A boost on a game you have no opinion on isn't an opportunity; it's a nudge. Be aware of how promotions are designed to influence behavior. See thinking traps.
A worked comparison
Two boosts are offered:
Boost A: Favorite from -200 to -150.
- Fair probability ~65%
- EV at -150: 0.65 × 66.67 − 0.35 × 100 = 43.3 − 35 = +8.3 per 100
Boost B: Four-leg parlay from +1200 to +1500.
- Fair probability of all four winning (each ~50%): 6.25%
- EV at +1500: 0.0625 × 1500 − 0.9375 × 100 = 93.75 − 93.75 = 0
Boost A is better value even though Boost B sounds more exciting.
Boosts and break-even rates
Another quick way to judge a boost is to compare break-even rates. At +150, you need to win 40% of the time to break even. At +200, you need only 33.3%. If your honest estimate of the true chance falls between those two numbers, the boost has turned a losing price into a winning one. If your estimate is below 33.3%, even the boosted price is too short, and the bigger number is simply a more attractive way to lose.
Learning without the marketing
On MockSport, there are no real-money boosts or promotions to chase. You see real odds and make free play-money picks, so you can focus on learning how prices work. Free tokens come from things like the daily bonus and inviting friends, not from boosted prices. Browse the odds page or the learn hub.
FAQ
What is an odds boost?
An odds boost is a promotion that increases a price above its normal level, so a winning pick pays more than usual.
Are odds boosts good value?
Some are, especially simple boosts on single selections. Many, particularly boosted parlays and long shots, still carry negative expected value.
How do I know if a boost is worth it?
Estimate the fair probability from the normal market, then calculate expected value at the boosted price. Positive EV means the boost is generous.