@Draugnar: although that's mostly a fair assessment, I want to say something about this bit:
"No one can live on the interest of 1 million dollars"
First of all, with, say, 2% interest, you get 20,000 (did that number the American way for you!) each year, which isn't too bad I'd say, but then there's inflation, interest might be lower and you might simply disagree that you can live off 20,000, so I'll accept your premise as plausible.
Now what I want to get to is that you don't need to live off interest only, even if you don't work or anything. Why? Because next to interest, you also have the actual million.
You can spread that million out over a century, and including 2% interest, you end up with over 30,000 per year on average if I got that right from the top of my head. I imagine that's well above the poverty line, and then there's still inflation of course, but I also assumed you live a century upon inheritance which is a rather safe guess, very much against my favour, which compensates for inflation quite well I'd say.
It's still arguable, depending on what you can live on and what you call living, but I dare say that I could live a decent life with 'just' a million.
I don't intend to spend more than $30,000 per year anytime soon, unless I decide to buy a house (one time) or a fairly expensive vehicle, but that's luxury IMO, for which I'd have to work.
I agree that a couple more million is probably better though. So I don't disagree with your conclusion, just that one sentence.