EXTREME INDULGENCES

They're charitable

The world class set their sights on impacting the world with their wealth. Some do it through philanthropy, others through business or various financial vehicles.

A handful of billionaires have taken to philanthropy, including founder and CEO of Bloomberg Media Michael Bloomberg, who has donated $3 billion over his lifetime.

And then there's the Giving Pledge, which Warren Buffett and Bill and Melinda Gates created in order to invite the world's wealthiest people to pledge more than half of their wealth to charitable causes either during their lives or in their wills. Some have even pledged to give away more than 99% of their fortunes.

Take John Paul DeJoria, cofounder of Patron tequila and Paul Mitchell hair products, who starts every day with five minutes of quiet reflection.

"Doesn't matter where I'm at, which home I'm in, or what hotel room I'm visiting," he says. "The very second I wake up, I stay in bed for about five minutes and just be."

They live below their means

Just because they have billions in the bank doesn't mean they have to indulge in overspending — in fact, some of the world's wealthiest people choose to live frugally.

Sam Walton, the founder of Wal-Mart, famously drove around in a 1979 Ford F150 pickup truck ... Mark Zuckerberg owns a modest $30,000 Acura TSX entry-level sedan ... Bill Gates was known to fly commercial for years.

Then there's legendary investor Warren Buffett, who is notably down to earth — he still lives in the same $31,500 home, and chooses a flip phone over a smart phone.

They pursue their passion

"You've got to find what you love," Apple cofounder Steve Jobs said during his 2005 commencement address to the graduates of Stanford University. "The only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it."

Jobs isn't the first to emphasize the importance of pursuing your passion. Author Napoleon Hill, who studied over 500 incredibly rich people in the early 20th century, wrote in his bestseller, "Think and Grow Rich": "No man can succeed in a line of endeavor which he does not like."

They read

Many of the world's most successful people are avid readers.

As Business Insider's Shana Lebowitz wrote:

Investing legend Warren Buffett reportedly spends about 80% of his day reading, and continues to include book recommendations in his annual shareholder letters.

In 2015, Facebook's Mark Zuckerberg resolved to read a book every two weeks ... Media mogul Oprah Winfrey selects a book every month for readers to discuss online as part of "Oprah's Book Club 2.0," and when tech billionaire Elon Musk is asked how he learned to build rockets, he reportedly answers, "I read books."

They develop multiple streams of income

The richest people focus on earning — so it comes as no surprise that they develop additional streams of income.

Richard Branson, the billionaire chair of the Virgin Group, epitomizes this habit, Corley explains in "Change Your Habits, Change Your Life." Branson has overseen about 500 companies and his brand is on somewhere between 200 and 300 of them.

Branson "puts the rich habit of having multiple streams of income on steroids," Corley writes. "His desire to expand the Virgin brand is really a desire to expand his streams of income. Branson learned very early on that this rich habit creates the most wealth."

They hang out with other successful people

The wealthiest people like to stand next to the smartest person in the room, notes author and podcast host James Altucher: "Harold Ramis did it (Bill Murray). Steve Jobs did it (Steve Wozniak). Craig Silverstein did it (Who? Larry Page). Kanye West did it (Jay-Z)."

In most cases, your net worth mirrors the level of your closest friends.