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Hometown Bias: The Real Cost of Betting on Your Own Team (and the One Exception)

You know more about your team than anyone. You have also never once believed, in March, that they would be bad this year. Both of those facts are doing something to the prices you are willing to pay, and only one of them is making you money.

Every fan who trades eventually notices the same uncomfortable pattern in their history: the results on their own team are worse than the results on everyone else's. The knowledge is real; the trouble is how it arrives, through hope, dread, grudges, and a memory that stores the miracle comebacks in HD and the routine collapses in a folder marked "not representative."

Markets have a name for paying extra because of how you feel about the asset: hometown bias. Around here, call it the fandom tax. This article is about what it costs, how to test yourself for it, and the one genuinely useful trade that fandom sets up.

The tax, mechanically

A prediction market price only rewards you when your probability estimate beats the market's (that is the whole game). The fan's problem is systematic: everything about fandom pushes your internal p on your own team up. You watch every game, so their good stretches are vivid to you. You know the injury excuses. Optimism is, for a fan, load-bearing: believing is the product you signed up for.

So the fan reliably experiences the market's honest price on their team as an insult. The market says 55¢; your heart says 70. And the expensive part: that gap feels identical to edge. "The market is undervaluing us" is indistinguishable, from the inside, from actual private information. Feeling right is not evidence.

Aggregate it and fan money is systematically on one side: fans overbuy their team at every price, which is also precisely why sportsbooks have always shaded lines against popular home teams: betting on your own team is so predictable that the books priced it in decades ago. They built a business on the fandom tax. The market just lets you see yourself paying it.

Information or affirmation: the three-question test

Fandom is not automatically disqualifying. A fan who watches every minute genuinely holds information casual money does not: rotation patterns, a lineman playing hurt, the backup goalie's numbers. The task is separating what you know from what you need to be true. Before trading your own team, three questions:

1. Would I make this exact trade on a team I feel nothing about? Rewrite the position with the names removed: "a 55¢ team at home, minus their starting corner, off a short week." Still a buy? Proceed. If the trade needs the logo to make sense, it is affirmation.

2. What specifically do I know that the market does not? A real answer is concrete and checkable. "The market has not adjusted to the lineup news yet" is information with a timestamp. "People always sleep on us" is a fight song.

3. Which direction do all my errors point? Pull up your trade history on your team. If the results skew worse than your other trading, your p on them carries a systematic markup. The fix is mechanical, not spiritual: either sit your team out entirely, or handicap yourself, knock several points off whatever probability your gut proposes before sizing it. And if you cannot pass the test, f = 0 is always available.

The exception: the emotional hedge

Now the fun part, the one trade where fandom and the math cooperate: buy NO on your own team.

It sounds like treason, and it is also the cheapest sports-fan insurance ever invented. Say your team is in a playoff game at 60¢. Buy the other side, the NO, at roughly 40¢. Two endings:

Your team wins. Your contracts expire worthless, you are out a few dollars, and you could not possibly care less, because your team just won the playoff game. Best money you ever lost.
Your team loses. You are crushed. And then a settlement lands in your account, a small dividend paid to you personally for your suffering. The night is still bad. It is measurably less bad.

This works because of a happy asymmetry: your emotional portfolio is desperately long your team, always, in a position you can never sell. The NO contract is the only counterweight on the market. You are not turning on the boys; you are hedging a position you were born holding. It is the same share-matching logic as any other hedge, pointed at your heart instead of your account.

(One warning label: keep it small. Sized too big, the hedge inverts your loyalties in the fourth quarter, and discovering you are quietly rooting for the collapse is its own kind of loss.)

What sharp fans actually do

The disciplined version of fan-trading, assembled from everything above: trade your team's games rarely and only through the three-question test; trade your knowledge of them freely on adjacent markets, player performance, opponents, and situations where your viewing hours are information without the loyalty attached; keep the emotional hedge in the toolkit for the nights that matter; and remember the market price of your team is not an opinion about your city, your childhood, or you. It is just this week's clearing price for hope, and some weeks, honestly, hope is overpriced.

Educational information, not financial advice. Prediction markets involve risk of loss, and their legal status varies by location and changes over time.