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They are also more likely to be relatively fit
And if not, they’re at least less likely to be intoxicated to the point of serious impairment. It was a party to celebrate a billionaire not going to prison, it’s almost certain that the guests were sloshed.
Also, most of the crew could tell that something was going seriously wrong, and could probably find the way out of the ship in a panic. The guests and rarely present owners would’ve relied entirely on the crew.
I would imagine that the crew has had to react to a crisis in the past that didn't involve a small wobble on the Stock Market. They are also more likely to be relatively fit and decent swimmers. There's a strong chance that they've relied on themselves to survive, not paid someone else to do it for them.