Reminds me of depression era Hollywood. The common theme was how rich people are unhappy, and people living on the edge of broke are living the most fulfilling and happy lives. Frank Capra was the king of movies like that. It Happened One Night (1934), You Can't Take it With You (1938), Mr. Smith Goes to Washington (1939). Among so many others. My Man Godfrey (1936).

There's enough that I can name ones just about poor people pretending to be royalty. Midnight (1939), Trouble in Paradise (1932), The Lady Eve (1941), Thirty Day Princess (1934), The Princess Comes Across (1936). And the previously mentioned Frank Capra also made Lady for a Day (1933), and remade it as Pocketful of Miracles (1961). All of those movies are about poor people pretending to be rich, all of them are romantic movies about the rich and poor falling in love with each other.

John Q (2002) is a Denzel Washington movie where he takes an ER hostage until they'll give his son a heart transplant. Feels even more relatable today. Kind of a different angle, not really about rich people.

EDIT: Easy Living (1937) is a great screwball comedy. A rich man throws an expensive fur coat out the window. A poor girl finds it, and suddenly gets treated like she's rich. Strongly recommend.

One of my favorite short animations (10min) is about a brutally frank look at the rich...

Dinner for Few
https://www.youtube.com/watch?v=HTDdIO74BuA

How about a scene where they get eaten?

Movie should be about a young idealist communist/anarchist who spend their days fantasizing about killing the wealthy and talking non stop about evil they are. Then this rich evil guy meets them one day and makes them an offer: if you hang out with me for 1 year I will let you murder me and you will get all my money and power, but you have to hang out with me for that 1 year and learn everything about my life and go to all my parties and meet all my friends. Then after 1 year the young idealist slowly learns and grows and starts loving the rich person who has given them so much and taught them so much. They can't do it! But the rich person dies anyway (they had cancer), and the young anarchist now gets their money, their multiple homes, and all their power and influence. And they decide they can do so much better if they don't give it up, if they don't start the revolution today, if they temporarily use these things to do good! They will finally be able to start the revolution and liberate the proletariat and usher in the utopia promised by their ideals.

And as they do this they start hurting people. They steal from others, first other rich people. Then they start feeling entitled to other people's things and their bodies. They host parties for other young anarchists, but they need people to provide the food, the music, and hire sex workers. And they are going to pay all these people very generously and give away their houses to these people and such, but it all goes so well, but the people who they hired aren't good anarchists/communists, they are clearly only in it for the money and are all greedy capitalists, some of them even own their homes! They really don't deserve their generosity, so they stiff and underpay the people they hired. But they also decide they should do it again, and again, and again, and just a bit longer they will hold onto all this money and power, it can't hurt right? The revolution will be tomorrow!

And fast forward 30 years and they never gave it up. They now have more money, more power, because what they had wasn't yet enough to start the revolution they still deeply believed in. They still keep hosting parties, boosting up communist/anarchist celebrities and influencers, and keep broadcasting their beliefs. But they get a diagnosis of cancer, time is running out. They have 6 months to live. There isn't time to start the revolution now! They have yet to compete the work... they need more time! so they go and find a young poor struggling idealists like themselves, and they know this person will never listen to them unless they offer to kill themselves and give all their power and money away to the killer, so that they can start the revolution...

AND THEN LUIGI COMES IN WITH A STEEL CHAIR!!!