I don't think that's true at all really, there are like 500,000 millionaires in my town alone.

A billion is actually just a lot of money, there's a much more finite amount of room at the top.

All you need to do to make a million quid in the UK is get a 75th percentile job and save half of it. After a few decades you are now a millionaire. I mean, everyone can't do it, but it's not some unfathomable task.

In the US I imagine it's even easier. Your median income is lower but the top end is insane.