Wouldn’t the viability of this dodge depend on being able to sell these maxed out yachts somewhere else without taking an utter beating? Are there a lot of customers for them in, say, Florida?
FL is a large and liquid market for ocean-crossing yachts. They might not get all of their money, but a lot is better than a little or nothing. Plus, they don’t always sell the yacht right away, but they can live on it for an extended period. Or they might not sell at all, but decide it’s a good time for some cruising, while awaiting developments in the Eurozone.