(Mental Floss) -- Owning a professional sports franchise is my dream job. (I'm willing to relocate.) Of course, I could never afford my own team. There's a better chance I'll miraculously develop an unhittable slider, or learn to punt.

NFL team owner Robert Kraft got his start in the paper business.

You obviously must be exceedingly wealthy to become an owner.

Did you ever wonder how all these people made all that money?

I sure hope you did, because we went and did all this research.

Here's a list of nine billionaire owners and how they built their fortunes.

1. Rich DeVos, Orlando Magic (NBA)

In 1959, DeVos and high school friend Jay Van Andel started selling all-purpose cleaner.

Their business grew to become Amway, which now brings in $6 billion each year under the ominous-sounding Alticor name.

Whether you see Amway as an empowering direct sales company or a something resembling a cult, it sure was good to DeVos.

Forbes estimates his wealth at $3.5 billion, making the paltry $85 million he spent on the Magic in 1991 a minor investment.

2. Robert L. Johnson, Charlotte Bobcats (NBA)

Lower on my list of dream jobs is running a cable network that caters to urban youth.

So I'm all kinds of envious of Robert L., who founded BET and sold it to Viacom for $3 billion in 2001.

His fortune was depleted by an expensive divorce, but Johnson's estimated net worth is still $1.1 billion.

His resume is full of firsts  BET was the first African-American owned company traded on the NYSE.

He was the first African-American billionaire in the U.S. And, in 2002, he became the first African-American majority owner of a professional sports franchise.

3. Robert Kraft, New England Patriots (NFL)

I'd never given it much thought, but I'd always assumed Kraft bought the Patriots with big cheese money he'd inherited.

But Kraft got his start in the paper business. His wife, Myra, is the daughter of Massachusetts philanthropist Jacob Hiatt.

After Kraft finished Harvard Business School, he went to work with his father-in-law's packaging company.

In 1972, Kraft founded International Forest Products, which is now part of the Kraft Group -- a diversified collection of companies ranging from Gillette Stadium to the New England Revolution (Major League Soccer) to Carmel Container Systems (Israel's largest packaging plant).

Kraft is seen as a savior in New England -- before he bought the team in 1994, the Pats seemed destined for relocation to St. Louis. Plus he's made them really, really good, winning three Super Bowls this decade.

Another reason I'm so keen on owning a team is the access to foreign heads of state.

In 2005, Kraft met Vladimir Putin, who walked off with one of Kraft's Super Bowl rings.

Kraft now claims it was a gift, but that might just be what you say when a Russian leader steals your jewelry. Mental Floss: How ex-presidents and prime ministers make ends meet

4. Hiroshi Yamauchi, Seattle Mariners (MLB)

Despite America's strong resistance to Japanese ownership -- and despite his admitted lack of interest in baseball -- Hiroshi Yamauchi became majority owner of the Seattle Mariners in 1992.

Yamauchi is the man credited with transforming Nintendo from playing-card company to video game giant.

His 55-year tenure saw incredible growth. But that doesn't mean there weren't a few bumps along the way. Forays into instant rice, taxi service and short-stay hotels (also known as "love hotels") did not pan out.

5. Jerry Jones, Dallas Cowboys (NFL)

Jerry Jones built an oil empire in the early 1970s, striking gas in the first thirteen wells he drilled. His father had given him a head start; Pat Jones sold the Modern Security Life Insurance Company for millions.

An undersized guard, Jones was captain of
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