Yeah, but if your company is making a million dollars per year and you aren't happy, then making a billion dollars a year wouldn't make you happy either. At that point, you're well past the point where money buys happiness.
Yes it is, but it's not a grotesque amount of money.
Anyway, the whole point is that having enough money that money is not a major point of stress in your life will help you to be happy, but beyond that it starts to anticorrelate. If you have founded a company that is making a million a year (I'm assuming we're talking about profit and not revenue), and money is a major point of stress in your life, your best bet (in terms of personal happiness) is to change your lifestyle so that you're living within those means.
Keep in mind, 99% of individuals in the world make less than $50k/year.