Last October, the New York Times was considering extreme yachts:

“Today, a megayacht is indispensable,” said Olivier Milliex, head of yacht finance at the Dutch bank ING. “It’s not like 15 years ago, when a yacht was a luxury item.” Hmm. I don’t have one, so I think “indispensible” isn’t the right word. Perhaps “megayacht ownership is assumed”?