Not really Fortune 500 CEO territory... For example, I have a friend who happens to live in Greenwich, CT, and interestingly enough, has a vacation home on Martha's Vineyard just like in the article, and a family of five, with all of the kids going to private schools, and a couple of cars, and a boat, and while he does work for a Fortune 500 company, with a decent position, he is taking home nowhere near what the top guys make, or the tier below that, or probably even the four or five tiers below that (and yes, I'm sure that it's a struggle to pay the bills for all of that, but it's not a lifestyle that only the few at the very top are living)...
How many folks actually live this kind of lifestyle is a fair question. You hit the top 10% of the income distribution (households) at about $105-110,000 and the top 5% at about $150-160,000. That doesn't get you anywhere close to the lifestyle Forbes is projecting here. I don't know how many families are in the $400-plus range, but however you crunch the numbers, the Forbes story sets a standard of "living well" that excludes well over 95% of American households.