Alex Finley, a former C.I.A. officer who has seen yachts proliferate near her home in Barcelona, has weighed the superyacht era and its discontents in writings and on Twitter, using the hashtag #YachtWatch. “To me, the yachts are not just yachts,” she told me. “In Russia’s case, these are the embodiment of oligarchs helping a dictator destabilize our democracy while utilizing our democracy to their benefit.” But, Finley added, it’s a mistake to think the toxic symbolism applies only to Russia. “The yachts tell a whole story about a Faustian capitalism—this idea that we’re ready to sell democracy for short-term profit,” she said. “They’re registered offshore. They use every loophole that we’ve put in place for illicit money and tax havens. So they play a role in this battle, writ large, between autocracy and democracy.”

After a morning on the docks at the Palm Beach show, I headed to a more secluded marina nearby, which had been set aside for what an attendant called “the really big hardware.” It felt less like a trade show than like a boutique resort, with a swimming pool and a terrace restaurant. Kevin Merrigan, a relaxed Californian with horn-rimmed glasses and a high forehead pinked by the sun, was waiting for me at the stern of Unbridled, a superyacht with a brilliant blue hull that gave it the feel of a personal cruise ship. He invited me to the bridge deck, where a giant screen showed silent video of dolphins at play.

Merrigan is the chairman of the brokerage Northrop & Johnson, which has ridden the tide of growing boats and wealth since 1949. Lounging on a sofa mounded with throw pillows, he projected a nearly postcoital level of contentment. He had recently sold the boat we were on, accepted an offer for a behemoth beside us, and begun negotiating the sale of yet another. “This client owns three big yachts,” he said. “It’s a hobby for him. We’re at a hundred and ninety-one feet now, and last night he said, ‘You know, what do you think about getting a two hundred and fifty?’ ” Merrigan laughed. “And I was, like, ‘Can’t you just have dinner?’ ”

Among yacht owners, there are some unwritten rules of stratification: a Dutch-built boat will hold its value better than an Italian; a custom design will likely get more respect than a “series yacht”; and, if you want to disparage another man’s boat, say that it looks like a wedding cake. But, in the end, nothing says as much about a yacht, or…