I don't like articles like this for two reasons: (1) they trivialize actually building a company, growing it, and selling it, and (2), they provide comfort for those that don't have the drive/luck/privilege of getting there by arguing that "hey, money doesn't make you happy!" First of all, as others mention in the thread, this is hardly an example of an "overnight success" -- there are no such examples, barring a few…
Money is obviously pretty great to have. The point of the cliche is to caution people about making too many sacrifices to chase millions.