Earlier quoted context omitted.
Assuming we're not talking "I have a retirement plan and a house so my net-worth is over a million" type of millionaire, isn't passing oneself off as a multi-millionaire instead of a billionaire a distinction without a difference? I guess I don't run in those circles, but it's still fabulous wealth either way.
It's the difference between someone having $2k and $1 million dollars.
The answer to that is: you have $1m of peace of mind to live your comfortable lifestyle of someone with $2k. Now living the lifestyle of someone woth $2k might not be particularly desirable to most, but living the life of a multi-millionaire with that relatively same level of peace of mind sounds like a crazy nice way to live.