Madeline Berg

At the annual New York Times DealBook Summit, Elon Musk was the hot topic of conversation among his fellow billionaires, CEOs, and political elite.

Dragonfly, which appears to be up for sale, is named after a once-secret Google product and is the largest of Brin's boats.

These heirs and heiresses between the ages of 18 and 40 stand to inherit massive amounts of wealth.

Gates is reportedly the No. 42 largest landowner in the country.

New custom builds from the world's most prestigious shipyards — Lurssen, Feadship, Oceanco, Benetti — can run into the hundreds of millions. Even a used superyacht can cost $75 million.

Prime customers got the news in emails on Tuesday and Wednesday.

Just some friendly advice.

"Quiet luxury" is a lifestyle for the reclusive rich.