Millionaire is actually just a x100 factor from a middle class saving account.
Each time, the real difference is not the physical goods anyway. From middle class to millionaire, it's the logistic that changes the most. You can live free of many constraints.
From millionaires to billionaires, it's more a matter of impact in the world. Having 100 luxury cars must be fun, but I can't imagine it changing your life that much.
But it's the gap from flying first class to owning private jets. Or renting a large yacht or owning a small one to owning a super-yacht with two helicopter pads and a sub (like e.g. Paul Allen's "Octopus" ).
But being able to influence politics, the economy, and knowing personnally many people that can, is a huge difference in what life you can experience.
And to be honest, I think the area where that happens is a problem. I'm fine with people enjoying a life of comfort, I'm not so fine with people buying significant over others, over the society in which we live, simply because they have more money. It's a danger to democracy.
The only way to avoid this problem is for the people to actively, on their day to day live, think and act toward the society they want to co-create. Power to the people implies responsability for the people.
And we are nowhere near that. People don't want the responsability. They have enough on their plate already with their personnal life issues. They don't want to have to choose every day what to buy, what to read, what to watch. They don't want to include the entire what they think society should be in the process of choosing education, home or a job.
So they vote to delegate the power and responsability once in a while and call the resulting oligarchy a democracy. Semantics is way easier than implementing the real solution.
It's not so much that the system has incredible resilience, as it is that the after-shocks of feudalism and colonialism are still incomplete: we still have dozens of countries shacking off the post-colonial conflicts and building basic infrastructure that allows for rapid initial growth in commerce.
We'll find out once the last groups of developing countries start seeing growth drop back to the levels of developed countries. That is likely to be decades still, as many parts of Africa in particular just entered the steep growth over the last decade or so.
Eventually, any kind of growth is limited in a closed system, so it makes sense that it will be the dawn of capitalism, provided we don't escape in space before.
But I'm surprised, almost disapointed, that we need to reach this extreem. I was expecting injustice, greed, health issues and the ponzi scheme aspect of our economic system to be the kicker. It never happened.
For example, if you just had twins and live in a big city paying for those kids education/uprbringing is going to cost maybe ~$2-4m (NPV) even if you have $10m, that is really meaningful number to you, and less so at $30m, $300m, $1b etc.
Once you hit that inflection point (which is different for everyone) the conversation changes from how do I aforrd to [pay for my kid’s education] to what do I want to do with my life, what do I enjoy doing, what is my legacy going to be....
For instance in the UK if you bought the $4.1m London home on a 25 year, 3% mortgage, with a 25% deposit you'd pay about $170k per year. But after tax your $290k "top-1%" income would be about $185k -- only just enough to even cover your mortgage, forget about school fees.
I wonder what the London, NY, LA etc 1% numbers are? Surely that's a fairer comparison to e.g. Singapore anyway, since it's a city-state.
At least according to this site  (which references a 2013 report ) for instance, to be in the 1% in New York state you have to be making at least $517,557. However, the average annual income of those in the 1% is $2,006,632.
In Mississippi, though, you only have to be making $264,952 to be in the 1% and the average annual income of the 1% in MS is $565,813.
Of course, you have to consider cost of living and what not, but 1% is definitely not the same everywhere.
However, it seems there has been an economic downturn recently and taxes have been increasing so the economic landscape of Middle Eastern countries could change.
I'm sure that shifts a bit from year to year