# Gambling odds questionSeptember 24, 2012 10:44 AM   Subscribe

How would one (legally) take advantage of the change in odds of a given NFL team to win the Super Bowl?

Say you placed a \$100 bet before the season started on the Arizona Cardinals to win the Super Bowl. The odds were 150-to-1, so if they won, you'd win \$15,000.

Currently, the Cardinals are 30-to-1 to win the Super Bowl. So the same \$100 bet would only pay \$3,000. If this was the stock market, you could trade out of your postion and pocket \$12,000 (net of transaction costs).

However, since you cannot legally accept bets like a casino, what bet(s) could you make now to guarantee yourself something close to \$12,000 (excluding transaction costs)?
posted by glenngulia to Sports, Hobbies, & Recreation (6 answers total) 4 users marked this as a favorite

You can't guarantee anything close to \$12,000.
You can place a bet that they won't win, which should give odds of 30-to-29 discounting the house edge. If you bet \$14500 of your your potential \$15,000 on this wager it would pay about \$15,000 if they don't win, netting you \$500 minus your original \$100 losing bet.
In other words, you'd win 500 if they win (\$15k win - 14.5K loss), and \$400 if they don't.
I didn't include house edge, so some of those guaranteed winnings would be eroded by that.
posted by rocket88 at 10:59 AM on September 24, 2012 [3 favorites]

You're wrong about what your \$100 bet at 150-1 is currently worth. Today, you'd have to put up \$500 at 30-1 to have a ticket worth \$15k in the event of a Cardinals win. So your ticket is worth \$500. You'd be able to trade out of it for a profit of \$400, not \$12000.
posted by Perplexity at 10:59 AM on September 24, 2012 [3 favorites]

Your "current value" of \$15000 is wrong.

Perplexity gave my answer (possibly worth \$500, profit \$400), but rocket88 tells you the why.

If you're thinking stock market, options might be the better parallel that straight up stock. You bought the option to win \$15000 for a ticket priced \$100. To buy that same option now, the ticket would cost \$500.
posted by k5.user at 11:03 AM on September 24, 2012

So what’s the point of placing a pre season bet if you don’t keep the odds you were given? Why not just bet at the last minute?
posted by bongo_x at 11:05 AM on September 24, 2012

What you're looking to do is called Arbitrage Betting. It is theoretically possible to place counterbalancing bets with two bookmakers giving different odds, guaranteeing yourself a profit no matter who wins.

Not surprisingly, the gambling industry tries to discourage this practice.
posted by alms at 11:12 AM on September 24, 2012

To add to what alms has said, the transaction cost of 10% (called "vig" in sports betting parlance) basically makes arbitrage betting infeasible except in extreme cases.
posted by chrchr at 11:33 AM on September 24, 2012

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