Sports Betting Exploded From $400 Million to $17 Billion And It’s Competing With Your Kid’s 401(k)

In 2018, legal sportsbooks across the country kept about $430 million.

Last year they kept $17 billion. That’s not the amount wagered either, which clocked in at $167 billion. The $17 billion is what never came back.

The industry got almost 40 times bigger in seven years, and it’s now legal in 39 states. But here’s the number that made me put my coffee down: Betterment’s new 2026 Retail Investor Survey found that 52% of Gen Z investors redirected money they’d earmarked for investing into sports betting in the past year. And 26% of them say betting is a deliberate part of their long-term financial strategy.

If there’s a twenty-something in your life, there’s a real chance part of their retirement is currently riding on a parlay.

The house keeps about 10 cents of every dollar

Sportsbooks held on to about 10% of everything wagered last year. That’s the average, blended across every bettor, including the sharp ones.

Compare that to the boring alternative. The stock market has averaged about 8% a year over the long run, though returns are never guaranteed and some years are ugly.

So the choice is roughly this: an asset that has historically paid you 8% a year, or a product engineered to keep 10% of every dollar you push through it. Betterment’s CEO put it bluntly, saying these apps are “designed to keep people seeking the next quick score.”

This isn’t a lecture about betting. It’s about which bucket the money comes from

I’m not anti-fun. Money for entertainment is a legitimate bucket, and if $30 a month on games with your friends makes football better, that’s a hobby, not a crisis.

The problem the survey exposes is bucket-swapping. Betting money should come from the entertainment bucket, the same place as concert tickets. It’s coming out of the long-haul bucket instead, the one that’s supposed to sit in low-cost index funds for decades.

And the same survey shows what that trade feels like later: only 44% of investors are confident about retirement, and among Gen X it’s just 31%. Ask a 50-something how they feel about the investing they skipped at 25.

What $100 a month becomes in each bucket

Here’s the math on $100 a month over a working life, using that 8% long-run average for the market. The sportsbook column assumes the average experience, where the money is entertainment spent, not wealth stored.

Even half that, $50 a month, grows to about $175,000 over 40 years.

The fix takes about 10 minutes and zero lectures

1. Automate the investing first. Set an automatic transfer to the 401(k) or Roth IRA for the day the paycheck lands. Money that moves before it’s visible never has to win an argument against a Sunday slate.
2. Give betting an official bucket. A fixed monthly amount, moved to a separate account or prepaid into the app. When it’s gone, the season’s over.
3. Add friction back. Delete the saved card, turn off deposit shortcuts, kill the notifications. These apps are optimized to make depositing effortless. Make it effortful.
4. Show the table, don’t preach it. If it’s your kid, one look at the 40-year row does more than any speech about responsibility.

The honest caveat: a disciplined bettor with a capped entertainment budget and an automated 401(k) contribution is doing nothing wrong. The math only turns tragic when the bet replaces the contribution.

The real gap is not $17 billion. It’s the ~$350,000 each of those redirected $100-a-month deposits could have become, quietly, while nobody was watching the game.

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